python成长之路【第十七篇】：玩转jQuery

一、jQuery简介

1.1、jQuery是什么

jQuery由美国人John Resig创建，至今已吸引了来自世界各地的众多 javascript高手加入其team。
jQuery是继prototype之后又一个优秀的Javascript框架。其宗旨是——WRITE LESS,DO MORE,写更少的代码,做更多的事情。
它是轻量级的js库(压缩后只有21k) ，这是其它的js库所不及的，它兼容CSS3，还兼容各种浏览器（IE 6.0+, FF 1.5+, Safari 2.0+, Opera 9.0+）。
jQuery是一个快速的，简洁的javaScript库，使用户能更方便地处理HTML documents、events、实现动画效果，并且方便地为网站提供AJAX交互。
jQuery还有一个比较大的优势是，它的文档说明很全，而且各种应用也说得很详细，同时还有许多成熟的插件可供选择。
jQuery能够使用户的html页保持代码和html内容分离，也就是说，不用再在html里面插入一堆js来调用命令了，只需定义id即可。

1.2、什么是jQuery对象？

jQuery 对象就是通过jQuery包装DOM对象后产生的对象。
jQuery 对象是 jQuery 独有的. 如果一个对象是 jQuery 对象, 那么它就可以使用 jQuery 里的方法: $(“#test”).html();

比如：

$("#test").html() 意思是指：获取ID为test的元素内的html代码。其中html()是jQuery里的方法

这段代码等同于用DOM实现代码： document.getElementById(" test ").innerHTML;

虽然jQuery对象是包装DOM对象后产生的，但是jQuery无法使用DOM对象的任何方法，同理DOM对象也不能使用jQuery里的方法.乱使用会报错

约定：如果获取的是 jQuery 对象, 那么要在变量前面加上$.

　　　　var $variable = jQuery 对象

　　　　var variable = DOM 对象

二、寻找元素(重要的选择器和筛选器)

2.1 选择器

2.1.1 基本选择器 $("*") $("#id") $(".class") $("element") $(".class,p,div")

2.1.2层级选择器 $(".outer div") $(".outer>div") $(".outer+div") $(".outer~div")

2.1.3 基本筛选器 $("li:first") $("li:eq(2)") $("li:even") $("li:gt(1)")

2.1.4 属性选择器 $('[id="div1"]') $('["alex="sb"][id]')

2.1.5 表单选择器 $("[type='text']")----->$(":text") 注意只适用于input标签

$("input:checked")

2.2 筛选器

2.2.1 过滤筛选器

$("li").eq(2) $("li").first() $("ul li").hasclass("test")

2.2.2 查找筛选器

$("div").children(".test") $("div").find(".test")

$(".test").next() $(".test").nextAll() $(".test").nextUntil()

$("div").prev() $("div").prevAll() $("div").prevUntil()

$(".test").parent() $(".test").parents() $(".test").parentUntil()

$("div").siblings()

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>left_menu</title>

    <script src="js/jquery-2.2.3.js"></script>

    <script>

          function show(self){

//              console.log($(self).text())

              $(self).next().removeClass("hide")

              $(self).parent().siblings().children(".con").addClass("hide")

          }

    </script>

    <style>

          .menu{

              height: 500px;

              width: 30%;

              background-color: gainsboro;

              float: left;

          }

          .content{

              height: 500px;

              width: 70%;

              background-color: rebeccapurple;

              float: left;

          }

         .title{

             line-height: 50px;

             background-color: #425a66;

             color: forestgreen;}

         .hide{

             display: none;

         }

    </style>

</head>

<body>

<div class="outer">

    <div class="menu">

        <div class="item">

            <div class="title" onclick="show(this);">菜单一</div>

            <div class="con">

                <div>111</div>

                <div>111</div>

                <div>111</div>

            </div>

        </div>

        <div class="item">

            <div class="title" onclick="show(this);">菜单二</div>

            <div class="con hide">

                <div>111</div>

                <div>111</div>

                <div>111</div>

            </div>

        </div>

        <div class="item">

            <div class="title" onclick="show(this);">菜单三</div>

            <div class="con hide">

                <div>111</div>

                <div>111</div>

                <div>111</div>

            </div>

        </div>

    </div>

    <div class="content"></div>

</div>

</body>

</html>

左侧菜单

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>tab</title>

    <script src="js/jquery-2.2.3.js"></script>

    <script>

           function tab(self){

               var index=$(self).attr("xxx")

               $("#"+index).removeClass("hide").siblings().addClass("hide")

               $(self).addClass("current").siblings().removeClass("current")

           }

    </script>

    <style>

        *{

            margin: 0px;

            padding: 0px;

        }

        .tab_outer{

            margin: 0px auto;

            width: 60%;

        }

        .menu{

            background-color: #cccccc;

            /*border: 1px solid red;*/

            line-height: 40px;

        }

        .menu li{

            display: inline-block;

        }

        .menu a{

            border-right: 1px solid red;

            padding: 11px;

        }

        .content{

            background-color: tan;

            border: 1px solid green;

            height: 300px;

        }

        .hide{

            display: none;

        }

        .current{

            background-color: darkgray;

            color: yellow;

            border-top: solid 2px rebeccapurple;

        }

    </style>

</head>

<body>

      <div class="tab_outer">

          <ul class="menu">

              <li xxx="c1" class="current" onclick="tab(this);">菜单一</li>

              <li xxx="c2" onclick="tab(this);">菜单二</li>

              <li xxx="c3" onclick="tab(this);">菜单三</li>

          </ul>

          <div class="content">

              <div id="c1">内容一</div>

              <div id="c2" class="hide">内容二</div>

              <div id="c3" class="hide">内容三</div>

          </div>

      </div>

</body>

</html>

示例：tab切换

三、操作元素(属性 CSS 和文档处理)

3.1 属性操作

$("p").text() $("p").html() $(":checkbox").val()

$(".test").attr("alex") $(".test").attr("alex","sb")

$(".test").attr("checked","checked") $(":checkbox").removeAttr("checked")

$(".test").prop("checked",true)

$(".test").addClass("hide")

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

    <script src="js/jquery-2.2.3.js"></script>

    <script>

             function selectall(){

                 $("table :checkbox").prop("checked",true)

             }

             function che(){

                 $("table :checkbox").prop("checked",false)

             }

             function reverse(){

//                 var idlist=$("table :checkbox")

//                 for(var i=0;i<idlist.length;i++){

//                     var element=idlist[i];

//

//                     var ischecked=$(element).prop("checked")

//                     if (ischecked){

//                         $(element).prop("checked",false)

//                     }

//                     else {

//                         $(element).prop("checked",true)

//                     }

//

//                 }

                 $("table :checkbox").each(function(){

                     if ($(this).prop("checked")){

                         $(this).prop("checked",false)

                     }

                     else {

                         $(this).prop("checked",true)

                     }

                 });

//                 li=[10,20,30,40]

////                 dic={name:"yuan",sex:"male"}

//                 $.each(li,function(i,x){

//                     console.log(i,x)

//                 })

             }

    </script>

</head>

<body>

     <button onclick="selectall();">全选</button>

     <button onclick="che();">取消</button>

     <button onclick="reverse();">反选</button>

     <table border="">

         <tr>

             <td><input type="checkbox"></td>

             <td>111</td>

         </tr>

         <tr>

             <td><input type="checkbox"></td>

             <td>222</td>

         </tr>

         <tr>

             <td><input type="checkbox"></td>

             <td>333</td>

         </tr>

         <tr>

             <td><input type="checkbox"></td>

             <td>444</td>

         </tr>

     </table>

</body>

</html>

示例：编辑框正反选

<!DOCTYPE html>

<html>

    <head>

        <meta charset="utf-8" />

        <title>批量编辑</title>

        <!--<link rel="stylesheet" href="css/mycss.css" />-->

        <style>

            *{

    margin: 0;

    padding: 0;

}

body {

  font-family: 'Open Sans', sans-serif;

  font-weight: 300;

  line-height: 1.42em;

  color:rebeccapurple;

  background-color:goldenrod;

}

h1 {

  font-size:3em;

  font-weight: 300;

  line-height:1em;

  text-align: center;

  color: #4DC3FA;

}

.blue {

    color: #185875;

}

.yellow {

    color: #FFF842;

    }

/*!*弹出层罩子*!*/

#full {

    background-color:gray;

    left:0;

    opacity:0.7;

    position:absolute;

    top:0;

    filter:alpha(opacity=30);

}

.modified {

    background-color: #1F2739;

    border:3px solid whitesmoke;

    height:400px;

    left:50%;

    margin:-200px 0 0 -200px;

    padding:1px;

    position:fixed;

    /*position:absolute;*/

    top:50%;

    width:400px;

    display:none;

}

li {

    list-style: none;

    margin: 20px 0 0 50px;

    color: #FB667A;

}

input[type="text"] {

  padding: 10px;

  border: solid 1px #dcdcdc;

  /*transition: box-shadow 3s, border 3s;*/

}

.iputbutton {

    margin: 60px 0 0 50px;

    color: whitesmoke;

    background-color: #FB667A;

    height: 30px;

    width: 100px;

    border: 1px dashed;

}

.container th h1 {

    font-weight: bold;

    font-size: 1em;

      text-align: left;

      color: #185875;

}

.container td {

    font-weight: normal;

    font-size: 1em;

}

.container {

    width: 80%;

    margin: 0 auto;

}

.container td, .container th {

    padding-bottom: 2%;

    padding-top: 2%;

      padding-left:2%;

}

/*单数行*/

.container tr:first-child {

    background-color: red;

}

/*偶数行*/

.container tr:not(first-child){

      background-color: cyan;

}

.container th {

    background-color: #1F2739;

}

.container td:last-child {

    color: #FB667A;

}

/*鼠标进过行*/

.container tr:hover {

   background-color: #464A52;

}

/*鼠标进过列*/

.container td:hover {

  background-color: #FB667A;

  color: #403E10;

  font-weight: bold;

  transform: translate3d(5px, -5px, 0);

}

        </style>

        <script src="jquery-2.2.3.js"></script>

        <script>

            //点击【编辑】显示

$(function () {

    $("table[name=host] tr:gt(0) td:last-child").click(function (event) {

        alert("");

//        $("#full").css({height:"100%",width:"100%"});

        $(".modified").data('current-edit-obj', $(this));

        $(".modified,#full").show();

        var hostname = $(this).siblings("td[name=hostname]").text();

        $(".modified #hostname").val(hostname);

        var ip = $(this).siblings("td[name=ip]").text();

        $(".modified #ip").val(ip);

        var port = $(this).siblings("td[name=port]").text();

        $(".modified #port").val(port);

    });

    //取消编辑

    $(".modified #cancel").bind("click", function () {

        $(".modified,#full").hide();

    });

//    确定修改

    $(".modified #ok").bind("click", function (event) {

        var check_status = true;

        var ths = $(".modified").data('current-edit-obj');

        var hostname = $(".modified #hostname").val().trim();

        var ip = $(".modified #ip").val().trim();

        var port = $(".modified #port").val().trim();

        var port = parseInt(port);

        console.log(port);

        //        端口为空设置为22

        if (isNaN(port)) {

            alert("您没有设置正常的SSH端口号，将采用默认22号端口");

            var port = 22;

        }else if ( port > 65535) {

        //            如果端口不是一个数字 或者端口大于65535

            var check_status = false;

            $(".modified #port").css("border-color","red");

            alert("端口号超过范围!")

        };

        // 主机和ip不能是空

        if ( hostname == ""){

            var check_status = false;

            $(".modified #hostname").css("border-color","red");

        }else if (ip == "") {

            var check_status = false;

            $(".modified #ip").css("border-color","red");

        };

        if (check_status == false){

            return false;

        }else{

            //$(this).css("height","60px")   为什么不用$(this),而用$()

            $(ths).siblings("td[name=hostname]").text(hostname);

            $(ths).siblings("td[name=ip]").text(ip);

            $(ths).siblings("td[name=port]").text(port);

            $(".modified,#full").hide();

        };

    });

});

        </script>

    </head>

    <body>

        <h1>

            <span class="blue">&lt;</span>Homework1<span class="blue">&gt;</span> <span class="yellow">HostList</span>

        </h1>

        <div id="full">

            <div class="modified">

                <li>主机名：<input id="hostname" type="text" value="" />*</li>

                <li>ip地址：<input id="ip" type="text" value="" />*</li>

                <li>端口号：<input id="port" type="text" value="" />[0-65535]</li>

                    <div id="useraction">

                     <input class="iputbutton" type="button" name="确定" id="ok" value="确定"/>

                    <input class="iputbutton" type="button" name="取消" id="cancel" value="取消"/>

                    </div>

            </div>

        </div>

        <table class="container" name="host">

            <tr>

                <th><h1>主机名</h1></th>

                <th><h1>IP地址</h1></th>

                <th><h1>端口</h1></th>

                <th><h1>操作</h1></th>

            </tr>

            <tr>

                <td name="hostname">web01</td>

                <td name="ip">192.168.2.1</td>

                <td name="port">22</td>

                <td>编辑 </td>

            </tr>

            <tr>

                <td name="hostname">web02</td>

                <td name="ip">192.168.2.2</td>

                <td name="port">223</td>

                <td>编辑 </td>

            </tr>

            <tr>

                <td name="hostname">web03</td>

                <td name="ip">192.168.2.3</td>

                <td name="port">232</td>

                <td>编辑 </td>

            </tr>

            <tr>

                <td name="hostname">web04</td>

                <td name="ip">192.168.2.4</td>

                <td name="port">232</td>

                <td>编辑 </td>

            </tr>

        </table>

    </body>

</html>

示例：模态对话框

3.2 CSS操作

3.2.1(样式) css("{color:'red',backgroud:'blue'}")

3.2.2(位置) offset() position() scrollTop() scrollLeft()

3.2.3(尺寸) height() width()

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

    <script src="js/jquery-2.2.3.js"></script>

    <script>

          window.onscroll=function(){

              var current=$(window).scrollTop();

              console.log(current)

              if (current>100){

                  $(".returnTop").removeClass("hide")

              }

              else {

              $(".returnTop").addClass("hide")

          }

          }

           function returnTop(){

//               $(".div1").scrollTop(0);

               $(window).scrollTop(0)

           }

    </script>

    <style>

        body{

            margin: 0px;

        }

        .returnTop{

            height: 60px;

            width: 100px;

            background-color: darkgray;

            position: fixed;

            right: 0;

            bottom: 0;

            color: greenyellow;

            line-height: 60px;

            text-align: center;

        }

        .div1{

            background-color: orchid;

            font-size: 5px;

            overflow: auto;

            width: 500px;

        }

        .div2{

            background-color: darkcyan;

        }

        .div3{

            background-color: aqua;

        }

        .div{

            height: 300px;

        }

        .hide{

            display: none;

        }

    </style>

</head>

<body>

     <div class="div1 div">

         <p>hello</p>

         <p>hello</p>

         <p>hello</p>

         <p>hello</p>

         <p>hello</p>

         <p>hello</p>

         <p>hello</p>

         <p>hello</p>

         <p>hello</p>

         <p>hello</p>

         <p>hello</p>

         <p>hello</p>

         <p>hello</p>

         <p>hello</p>

         <p>hello</p>

         <p>hello</p>

         <p>hello</p>

         <p>hello</p>

     </div>

     <div class="div2 div"></div>

     <div class="div3 div"></div>

     <div class="returnTop hide" onclick="returnTop();">返回顶部</div>

</body>

</html>

示例：返回顶部

<!DOCTYPE html>

<html>

<head lang="en">

    <meta charset="UTF-8">

    <title></title>

    <style>

        body{

            margin: 0px;

        }

        img {

            border: 0;

        }

        ul{

            padding: 0;

            margin: 0;

            list-style: none;

        }

        .clearfix:after {

            content: ".";

            display: block;

            height: 0;

            clear: both;

            visibility: hidden;

        }

        .wrap{

            width: 980px;

            margin: 0 auto;

        }

        .pg-header{

            background-color: #303a40;

            -webkit-box-shadow: 0 2px 5px rgba(0,0,0,.2);

            -moz-box-shadow: 0 2px 5px rgba(0,0,0,.2);

            box-shadow: 0 2px 5px rgba(0,0,0,.2);

        }

        .pg-header .logo{

            float: left;

            padding:5px 10px 5px 0px;

        }

        .pg-header .logo img{

            vertical-align: middle;

            width: 110px;

            height: 40px;

        }

        .pg-header .nav{

            line-height: 50px;

        }

        .pg-header .nav ul li{

            float: left;

        }

        .pg-header .nav ul li a{

            display: block;

            color: #ccc;

            padding: 0 20px;

            text-decoration: none;

            font-size: 14px;

        }

        .pg-header .nav ul li a:hover{

            color: #fff;

            background-color: #425a66;

        }

        .pg-body{

        }

        .pg-body .catalog{

            position: absolute;

            top:60px;

            width: 200px;

            background-color: #fafafa;

            bottom: 0px;

        }

        .pg-body .catalog.fixed{

            position: fixed;

            top:10px;

        }

        .pg-body .catalog .catalog-item.active{

            color: #fff;

            background-color: #425a66;

        }

        .pg-body .content{

            position: absolute;

            top:60px;

            width: 700px;

            margin-left: 210px;

            background-color: #fafafa;

            overflow: auto;

        }

        .pg-body .content .section{

            height: 500px;

        }

    </style>

</head>

<body>

    <div class="pg-header">

        <div class="wrap clearfix">

            <div class="logo">

                <a href="#">

                    <img src="data:images/3.jpg">

                </a>

            </div>

            <div class="nav">

                <ul>

                    <li>

                        <a  href="#">首页</a>

                    </li>

                    <li>

                        <a  href="#">功能一</a>

                    </li>

                    <li>

                        <a  href="#">功能二</a>

                    </li>

                </ul>

            </div>

        </div>

    </div>

    <div class="pg-body">

        <div class="wrap">

            <div class="catalog">

                <div class="catalog-item" auto-to="function1"><a>第1张</a></div>

                <div class="catalog-item" auto-to="function2"><a>第2张</a></div>

                <div class="catalog-item" auto-to="function3"><a>第3张</a></div>

            </div>

            <div class="content">

                <div menu="function1" class="section">

                    <h1>第一章</h1>

                </div>

                <div menu="function2" class="section">

                    <h1>第二章</h1>

                </div>

                <div menu="function3" class="section">

                    <h1>第三章</h1>

                </div>

            </div>

        </div>

    </div>

    <script type="text/javascript" src="js/jquery-2.2.3.js"></script>

    <script type="text/javascript">

     window.onscroll=function(){

         var ws=$(window).scrollTop()

         if (ws>50){

             $(".catalog").addClass("fixed")

         }

         else {

             $(".catalog").removeClass("fixed")

         }

         $(".content").children("").each(function(){

          var offtop=$(this).offset().top;

//             console.log(offtop)

             var total=$(this).height()+offtop;

             if (ws>offtop && ws<total){

                 if($(window).height()+$(window).scrollTop()==$(document).height()){

                     var index=$(".catalog").children(" :last").css("fontSize","40px").siblings().css("fontSize","12px")

                     console.log(index)

                 target='div[auto-to="'+index+'"]';

                 $(".catalog").children(target).css("fontSize","40px").siblings().css("fontSize","12px")

                 }

                 else{

                      var index=$(this).attr("menu");

                 target='div[auto-to="'+index+'"]';

                 $(".catalog").children(target).css("fontSize","40px").siblings().css("fontSize","12px")

                 }

             }

         })

     }

    </script>

</body>

</html>

示例：滚动菜单

3.3 文档处理

内部插入 $("#c1").append("<b>hello</b>") $("p").appendTo("div")

prepend() prependTo()

外部插入 before() insertBefore() after insertAfter()

replaceWith() remove() empty() clone()

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

</head>

<body>

            <div class="outer">

                <div class="condition">

                        <div class="icons" style="display:inline-block">

                            <a onclick="add(this);"><button>+</button></a>

                        </div>

                        <div class="input" style="display:inline-block">

                            <input type="checkbox">

                            <input type="text" value="alex">

                        </div>

                </div>

            </div>

<script src="js/jquery-2.2.3.js"></script>

    <script>

            function add(self){

                var $duplicate = $(self).parent().parent().clone();

                $duplicate.find('a[onclick="add(this);"]').attr('onclick',"removed(this)").children("").text("-");

                $duplicate.appendTo($(self).parent().parent().parent());

            }

           function removed(self){

               $(self).parent().parent().remove()

           }

    </script>

</body>

</html>

示例：clone方法的应用

3.4 事件

3.4.1

$(document).ready(function(){}) -----------> $(function(){})

3.4.2

$("p").click(function(){})

$("p").bind("click",function(){})

$("ul").delegate("li","click",function(){})

<!DOCTYPE html>

<html>

<head lang="en">

    <meta charset="UTF-8">

    <title></title>

</head>

<body>

    <div style="border: 1px solid #ddd;width: 600px;position: absolute;">

        <div id="title" style="background-color: black;height: 40px;color: white;">

            标题

        </div>

        <div style="height: 300px;">

            内容

        </div>

    </div>

<script type="text/javascript" src="jquery-2.2.3.js"></script>

<script>

    $(function(){

        // 页面加载完成之后自动执行

        $('#title').mouseover(function(){

            $(this).css('cursor','move');

        }).mousedown(function(e){

            //console.log($(this).offset());

            var _event = e || window.event;

            // 原始鼠标横纵坐标位置

            var ord_x = _event.clientX;

            var ord_y = _event.clientY;

            var parent_left = $(this).parent().offset().left;

            var parent_top = $(this).parent().offset().top;

            $(this).bind('mousemove', function(e){

                var _new_event = e || window.event;

                var new_x = _new_event.clientX;

                var new_y = _new_event.clientY;

                var x = parent_left + (new_x - ord_x);

                var y = parent_top + (new_y - ord_y);

                $(this).parent().css('left',x+'px');

                $(this).parent().css('top',y+'px');

            })

        }).mouseup(function(){

            $(this).unbind('mousemove');

        });

    })

</script>

</body>

</html>

示例：拖动面板

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>bigger</title>

    <style>

        *{

            margin: 0;

            padding:0;

        }

        .outer{

            height: 350px;

            width: 350px;

            border: dashed 5px cornflowerblue;

        }

        .outer .small_box{

            position: relative;

        }

        .outer .small_box .float{

            height: 175px;

            width: 175px;

            background-color: darkgray;

            opacity: 0.4;

            fill-opacity: 0.4;

            position: absolute;

            display: none;

        }

        .outer .big_box{

            height: 400px;

            width: 400px;

            overflow: hidden;

            position:absolute;

            left: 360px;

            top: 0px;

            z-index: 1;

            border: 5px solid rebeccapurple;

            display: none;

        }

        .outer .big_box img{

            position: absolute;

            z-index: 5;

        }

    </style>

</head>

<body>

        <div class="outer">

            <div class="small_box">

                <div class="float"></div>

                <img src="small.jpg">

            </div>

            <div class="big_box">

                <img src="big.jpg">

            </div>

        </div>

<script src="js/jquery-2.2.3.js"></script>

<script>

    $(function(){

          $(".small_box").mouseover(function(){

              $(".float").css("display","block");

              $(".big_box").css("display","block")

          })

          $(".small_box").mouseout(function(){

              $(".float").css("display","none");

              $(".big_box").css("display","none")

          })

          $(".small_box").mousemove(function(e){

              var _event=e || window.event;

              var float_width=$(".float").width();

              var float_height=$(".float").height();

              console.log(float_height,float_width);

              var float_height_half=float_height/2;

              var float_width_half=float_width/2;

              console.log(float_height_half,float_width_half);

               var small_box_width=$(".small_box").height();

               var small_box_height=$(".small_box").width();

//  鼠标点距离左边界的长度与float应该与左边界的距离差半个float的width,height同理

              var mouse_left=_event.clientX-float_width_half;

              var mouse_top=_event.clientY-float_height_half;

              if(mouse_left<0){

                  mouse_left=0

              }else if (mouse_left>small_box_width-float_width){

                  mouse_left=small_box_width-float_width

              }

              if(mouse_top<0){

                  mouse_top=0

              }else if (mouse_top>small_box_height-float_height){

                  mouse_top=small_box_height-float_height

              }

               $(".float").css("left",mouse_left+"px");

               $(".float").css("top",mouse_top+"px")

               var percentX=($(".big_box img").width()-$(".big_box").width())/ (small_box_width-float_width);

               var percentY=($(".big_box img").height()-$(".big_box").height())/(small_box_height-float_height);

              console.log(percentX,percentY)

               $(".big_box img").css("left", -percentX*mouse_left+"px")

               $(".big_box img").css("top", -percentY*mouse_top+"px")

          })

    })

</script>

</body>

</html>

示例：放大镜

3.5 动画效果

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

    <script src="js/jquery-2.2.3.js"></script>

    <script>

    /**

 * Created by yuan on 16/5/5.

 */

$(document).ready(function(){

    $("#hide").click(function(){

        $("p").hide(1000);

    });

    $("#show").click(function(){

        $("p").show(1000);

    });

//用于切换被选元素的 hide() 与 show() 方法。

    $("#toggle").click(function(){

        $("p").toggle();

    })

 for (var i= 0;i<7;i++){

//            颠倒了常规的$(A).append(B)的操作，即不是把B追加到A中，而是把A追加到B中。

            $("<div>").appendTo(document.body);

        }

        $("div").click(function(){

          $(this).hide(2000);

        });

});

    </script>

    <link type="text/css" rel="stylesheet" href="style.css">

</head>

<body>

    <!--1 隐藏与显示-->

    <!--2 淡入淡出-->

    <!--3 滑动-->

    <!--4 效果-回调:每一个动画执行完毕之后所能执行的函数方法或者所能做的一件事-->

    <p>hello</p>

    <button id="hide">隐藏</button>

    <button id="show">显示</button>

    <button id="toggle">隐藏/显示</button>

</body>

</html>

示例：隐藏和显示

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

    <script src="js/jquery-2.2.3.js"></script>

    <script>

    $(document).ready(function(){

   $("#in").click(function(){

       $("#id1").fadeIn(1000);

       $("#id2").fadeIn(1000);

       $("#id3").fadeIn(1000);

   });

    $("#out").click(function(){

       $("#id1").fadeOut(1000);

       $("#id2").fadeOut(1000);

       $("#id3").fadeOut(1000);

   });

    $("#toggle").click(function(){

       $("#id1").fadeToggle(1000);

       $("#id2").fadeToggle(1000);

       $("#id3").fadeToggle(1000);

   });

    $("#fadeto").click(function(){

       $("#id1").fadeTo(1000,0.4);

       $("#id2").fadeTo(1000,0.5);

       $("#id3").fadeTo(1000,0);

   });

});

    </script>

</head>

<body>

      <button id="in">fadein</button>

      <button id="out">fadeout</button>

      <button id="toggle">fadetoggle</button>

      <button id="fadeto">fadeto</button>

      <div id="id1" style="display:none; width: 80px;height: 80px;background-color: blueviolet"></div>

      <div id="id2" style="display:none; width: 80px;height: 80px;background-color: orangered "></div>

      <div id="id3" style="display:none; width: 80px;height: 80px;background-color: darkgreen "></div>

</body>

</html>

示例：淡入和淡出

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

    <script src="js/jquery-2.2.3.js"></script>

    <script>

    $(document).ready(function(){

     $("#flipshow").click(function(){

         $("#content").slideDown(1000);

     });

      $("#fliphide").click(function(){

         $("#content").slideUp(1000);

     });

      $("#toggle").click(function(){

         $("#content").slideToggle(1000);

     })

  });

    </script>

    <style>

        #flipshow,#content,#fliphide,#toggle{

            padding: 5px;

            text-align: center;

            background-color: blueviolet;

            border:solid 1px red;

        }

        #content{

            padding: 50px;

            display: none;

        }

    </style>

</head>

<body>

    <div id="flipshow">出现</div>

    <div id="fliphide">隐藏</div>

    <div id="toggle">toggle</div>

    <div id="content">helloworld</div>

</body>

</html>

示例：滑动

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

    <script src="js/jquery-2.2.3.js"></script>

    <script>

    $(document).ready(function(){

   $("button").click(function(){

       $("p").hide(1000,function(){

           alert('动画结束')

       })

//       $("p").css('color','red').slideUp(1000).slideDown(2000)

   })

});

    </script>

</head>

<body>

  <button>隐藏</button>

  <p>helloworld helloworld helloworld</p>

</body>

</html>

示例：回调函数

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

    <script src="js/jquery-2.2.3.js"></script>

    <script src="index.js"></script>

    <script>

        /**

 * Created by yuan on 2016/5/6.

 */

//手动轮播效果

$(function(){

    var size=$(".img li").size()

    for (var i= 1;i<=size;i++){

        var li="<li>"+i+"</li>"

        $(".num").append(li);

    }

    //$(".img li").eq(0).show();

    $(".num li").eq(0).addClass("active");

    $(".num li").mouseover(function(){

       $(this).addClass("active").siblings().removeClass("active");

       var index=$(this).index();

       i=index;

       $(".img li").eq(index).fadeIn(1000).siblings().fadeOut(1000);

   });

i=0;

var t=setInterval(move,1500)

    function move(){

    i++;

    if(i==size){

        i=0;

    }

    $(".num li").eq(i).addClass("active").siblings().removeClass("active");

    $(".img li").eq(i).stop().fadeIn(1000).siblings().stop().fadeOut(1000);

};

    function moveL(){

    i--;

    if(i==-1){

        i=size-1;

    }

    $(".num li").eq(i).addClass("active").siblings().removeClass("active");

    $(".img li").eq(i).stop().fadeIn(1000).siblings().stop().fadeOut(1000);

}

    $(".out").hover(function(){

        clearInterval(t);

    },function(){

        t=setInterval(move,1500);

    });

    $(".out .right").click(function(){

        move()

    });

    $(".out .left").click(function(){

       moveL()

    })

});

    </script>

    <link type="text/css" rel="stylesheet" href="style.css">

    <style>

        *{

    margin: 0;

    padding: 0;

}

ul{

    list-style: none;

}

.out{

    width: 730px;

    height: 454px;

    /*border: 8px solid mediumvioletred;*/

    margin: 50px auto;

    position: relative;

}

.out .img li{

    position: absolute;

    left: 0;

    top: 0;

}

.out .num{

    position: absolute;

    left:0;

    bottom: 20px;

    text-align: center;

    font-size: 0;

    width: 100%;

}

.out .btn{

    position: absolute;

    top:50%;

    margin-top: -30px;

    width: 30px;

    height: 60px;

    background-color: aliceblue;

    color: black;

    text-align: center;

    line-height: 60px;

    font-size: 40px;

    display: none;

}

.out .num li{

    width: 20px;

    height: 20px;

    background-color: grey;

    color: #fff;

    text-align: center;

    line-height: 20px;

    border-radius: 50%;

    display: inline;

    font-size: 18px;

    margin: 0 10px;

    cursor: pointer;

}

.out .num li.active{

    background-color: red;

}

.out .left{

    left: 0;

}

.out .right{

    right: 0;

}

.out:hover .btn{

    display: block;

}

    </style>

</head>

<body>

     <div class="out">

         <ul class="img">

             <li><a href="#"><img src="data:images/1.jpg" alt=""></a></li>

             <li><a href="#"><img src="data:images/2.jpg" alt=""></a></li>

             <li><a href="#"><img src="data:images/3.jpg" alt=""></a></li>

             <li><a href="#"><img src="data:images/4.jpg" alt=""></a></li>

             <li><a href="#"><img src="data:images/5.jpg" alt=""></a></li>

         </ul>

         <ul class="num">

             <!--<li class="active">1</li>-->

             <!--<li>2</li>-->

             <!--<li>3</li>-->

             <!--<li>4</li>-->

             <!--<li>5</li>-->

         </ul>

         <div class="left btn"><</div>

         <div class="right btn">></div>

     </div>

</body>

</html>

京东轮播图

3.6 扩展(插件机制)

jquery.extend({})
jquery.fn.extend({})

<!DOCTYPE html>

<html lang="en">

<head>

    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

    <meta name="viewport" content="width=device-width">

    <meta http-equiv="X-UA-Compatible" content="IE=8">

    <title>购物商城</title>

    <style>

*{

    margin: 0;

    padding: 0;

}

.hide{

    display:none;

}

.header-nav {

    height: 39px;

    background: #c9033b;

}

.header-nav .bg{

    background: #c9033b;

}

.header-nav .nav-allgoods .menuEvent {

    display: block;

    height: 39px;

    line-height: 39px;

    text-decoration: none;

    color: #fff;

    text-align: center;

    font-weight: bold;

    font-family: 微软雅黑;

    color: #fff;

    width: 100px;

}

.header-nav .nav-allgoods .menuEvent .catName {

    height: 39px;

    line-height: 39px;

    font-size: 15px;

}

.header-nav .nav-allmenu a {

    display: inline-block;

    height: 39px;

    vertical-align: top;

    padding: 0 15px;

    text-decoration: none;

    color: #fff;

    float: left;

}

.header-menu a{

    color:#656565;

}

.header-menu .menu-catagory{

    position: absolute;

    background-color: #fff;

    border-left:1px solid #fff;

    height: 316px;

    width: 230px;

     z-index: 4;

     float: left;

}

.header-menu .menu-catagory .catagory {

    border-left:4px solid #fff;

    height: 104px;

    border-bottom: solid 1px #eaeaea;

}

.header-menu .menu-catagory .catagory:hover {

    height: 102px;

    border-left:4px solid #c9033b;

    border-bottom: solid 1px #bcbcbc;

    border-top: solid 1px #bcbcbc;

}

.header-menu .menu-content .item{

    margin-left:230px;

    position:absolute;

    background-color:white;

    height:314px;

    width:500px;

    z-index:4;

    float:left;

    border: solid 1px #bcbcbc;

    border-left:0;

    box-shadow: 1px 1px 5px #999;

}

    </style>

</head>

<body>

<div class="pg-header">

    <div class="header-nav">

        <div class="container narrow bg">

            <div class="nav-allgoods left">

                <a id="all_menu_catagory" href="#" class="menuEvent">

                    <strong class="catName">全部商品分类</strong>

                    <span class="arrow" style="display: inline-block;vertical-align: top;"></span>

                </a>

            </div>

        </div>

    </div>

    <div class="header-menu">

        <div class="container narrow hide">

            <div id="nav_all_menu" class="menu-catagory">

                <div class="catagory" float-content="one">

                    <div class="title">家电</div>

                    <div class="body">

                        <a href="#">空调</a>

                    </div>

                </div>

                <div class="catagory" float-content="two">

                    <div class="title">床上用品</div>

                    <div class="body">

                        <a href="http://www.baidu.com">床单</a>

                    </div>

                </div>

                <div class="catagory" float-content="three">

                    <div class="title">水果</div>

                    <div class="body">

                        <a href="#">橘子</a>

                    </div>

                </div>

            </div>

            <div id="nav_all_content" class="menu-content">

                <div class="item hide" float-id="one">

                    <dl>

                        <dt><a href="#" class="red">厨房用品</a></dt>

                        <dd>

                            <span>| <a href="#" target="_blank" title="勺子">勺子</a> </span>

                        </dd>

                    </dl>

                    <dl>

                        <dt><a href="#" class="red">厨房用品</a></dt>

                        <dd>

                            <span>| <a href="#" target="_blank" title="菜刀">菜刀</a> </span>

                        </dd>

                    </dl>

                    <dl>

                        <dt><a href="#" class="red">厨房用品</a></dt>

                        <dd>

                            <span>| <a href="#">菜板</a> </span>

                        </dd>

                    </dl>

                    <dl>

                        <dt><a href="#" class="red">厨房用品</a></dt>

                        <dd>

                            <span>| <a href="#" target="_blank" title="碗">碗</a> </span>

                        </dd>

                    </dl>

                </div>

                <div class="item hide" float-id="two">

                    <dl>

                        <dt><a href="#" class="red">厨房用品</a></dt>

                        <dd>

                            <span>| <a href="#" target="_blank" title="">角阀</a> </span>

                        </dd>

                    </dl>

                    <dl>

                        <dt><a href="#" class="red">厨房用品</a></dt>

                        <dd>

                            <span>| <a href="#" target="_blank" title="角阀">角阀</a> </span>

                        </dd>

                    </dl>

                    <dl>

                        <dt><a href="#" class="red">厨房用品</a></dt>

                        <dd>

                            <span>| <a href="#" target="_blank" title="角阀">角阀</a> </span>

                        </dd>

                    </dl>

                </div>

                <div class="item hide" float-id="three">

                    <dl>

                        <dt><a href="#" class="red">厨房用品3</a></dt>

                        <dd>

                            <span>| <a href="#" target="_blank" title="角阀">角阀3</a> </span>

                        </dd>

                    </dl>

                    <dl>

                        <dt><a href="#" class="red">厨房用品3</a></dt>

                        <dd>

                            <span>| <a href="http://www.meilele.com/category-jiaofa/" target="_blank" title="角阀">角阀3</a> </span>

                        </dd>

                    </dl>

                </div>

            </div>

        </div>

    </div>

</div>

<script src="js/jquery-2.2.3.js"></script>

<script type="text/javascript">

    $(document).ready(function () {

        Change_Menu('#all_menu_catagory','#nav_all_menu', '#nav_all_content');

    });

    function Change_Menu(all_menu_catagory,menu, content) {

        $all_menu_catagory = $(all_menu_catagory);

        $menu = $(menu);

        $content = $(content);

        $all_menu_catagory.bind("mouseover", function () {

            $menu.parent().removeClass('hide');

        });

        $all_menu_catagory.bind("mouseout", function () {

            $menu.parent().addClass('hide');

        });

        $menu.children().bind("mouseover", function () {

            $menu.parent().removeClass('hide');

            $item_content = $content.find('div[float-id="' + $(this).attr("float-content") + '"]');

            $item_content.removeClass('hide').siblings().addClass('hide');

        });

        $menu.bind("mouseout", function () {

            $content.children().addClass('hide');

            $menu.parent().addClass('hide');

        });

        $content.children().bind("mouseover", function () {

            $menu.parent().removeClass('hide');

            $(this).removeClass('hide');

        });

        $content.children().bind("mouseout", function () {

            $(this).addClass('hide');

            $menu.parent().addClass('hide');

        });

    }

</script>

</body>

</html>

示例：商城菜单

<!DOCTYPE html>

<html>

<head lang="en">

    <meta charset="UTF-8">

    <title></title>

    <style>

        .edit-mode{

            background-color: #b3b3b3;

            padding: 8px;

            text-decoration: none;

            color: white;

        }

        .editing{

            background-color: #f0ad4e;

        }

    </style>

</head>

<body>

    <div style="padding: 20px">

        <input type="button" onclick="CheckAll('#edit_mode', '#tb1');" value="全选" />

        <input type="button" onclick="CheckReverse('#edit_mode', '#tb1');" value="反选" />

        <input type="button" onclick="CheckCancel('#edit_mode', '#tb1');" value="取消" />

        <a id="edit_mode" class="edit-mode" href="javascript:void(0);"  onclick="EditMode(this, '#tb1');">进入编辑模式</a>

    </div>

    <table border="">

        <thead>

        <tr>

            <th>选择</th>

            <th>主机名</th>

            <th>端口</th>

            <th>状态</th>

        </tr>

        </thead>

        <tbody id="tb1">

            <tr>

                <td><input type="checkbox" /></td>

                <td edit="true">v1</td>

                <td>v11</td>

                <td edit="true" edit-type="select" sel-val="" global-key="STATUS">在线</td>

            </tr>

            <tr>

                <td><input type="checkbox" /></td>

                <td edit="true">v1</td>

                <td>v11</td>

                <td edit="true" edit-type="select" sel-val="" global-key="STATUS">下线</td>

            </tr>

            <tr>

                <td><input type="checkbox" /></td>

                <td edit="true">v1</td>

                <td>v11</td>

                <td edit="true" edit-type="select" sel-val="" global-key="STATUS">在线</td>

            </tr>

        </tbody>

    </table>

    <script type="text/javascript" src="js/jquery-2.2.3.js"></script>

    <script>

        /*

         监听是否已经按下control键

         */

        window.globalCtrlKeyPress = false;

        window.onkeydown = function(event){

            if(event && event.keyCode == 17){

                window.globalCtrlKeyPress = true;

            }

        };

        window.onkeyup = function(event){

            if(event && event.keyCode == 17){

                window.globalCtrlKeyPress = false;

            }

        };

        /*

         按下Control，联动表格中正在编辑的select

         */

        function MultiSelect(ths){

            if(window.globalCtrlKeyPress){

                var index = $(ths).parent().index();

                var value = $(ths).val();

                $(ths).parent().parent().nextAll().find("td input[type='checkbox']:checked").each(function(){

                    $(this).parent().parent().children().eq(index).children().val(value);

                });

            }

        }

    </script>

    <script type="text/javascript">

$(function(){

    BindSingleCheck('#edit_mode', '#tb1');

});

function BindSingleCheck(mode, tb){

    $(tb).find(':checkbox').bind('click', function(){

        var $tr = $(this).parent().parent();

        if($(mode).hasClass('editing')){

            if($(this).prop('checked')){

                RowIntoEdit($tr);

            }else{

                RowOutEdit($tr);

            }

        }

    });

}

function CreateSelect(attrs,csses,option_dict,item_key,item_value,current_val){

    var sel= document.createElement('select');

    $.each(attrs,function(k,v){

        $(sel).attr(k,v);

    });

    $.each(csses,function(k,v){

        $(sel).css(k,v);

    });

    $.each(option_dict,function(k,v){

        var opt1=document.createElement('option');

        var sel_text = v[item_value];

        var sel_value = v[item_key];

        if(sel_value==current_val){

            $(opt1).text(sel_text).attr('value', sel_value).attr('text', sel_text).attr('selected',true).appendTo($(sel));

        }else{

            $(opt1).text(sel_text).attr('value', sel_value).attr('text', sel_text).appendTo($(sel));

        }

    });

    return sel;

}

STATUS = [

    {'id': 1, 'value': "在线"},

    {'id': 2, 'value': "下线"}

];

BUSINESS = [

    {'id': 1, 'value': "车上会"},

    {'id': 2, 'value': "二手车"}

];

function RowIntoEdit($tr){

    $tr.children().each(function(){

        if($(this).attr('edit') == "true"){

            if($(this).attr('edit-type') == "select"){

                var select_val = $(this).attr('sel-val');

                var global_key = $(this).attr('global-key');

                var selelct_tag = CreateSelect({"onchange": "MultiSelect(this);"}, {}, window[global_key], 'id', 'value', select_val);

                $(this).html(selelct_tag);

            }else{

                var orgin_value = $(this).text();

                var temp = "<input value='"+ orgin_value+"' />";

                $(this).html(temp);

            }

        }

    });

}

function RowOutEdit($tr){

    $tr.children().each(function(){

        if($(this).attr('edit') == "true"){

            if($(this).attr('edit-type') == "select"){

                var new_val = $(this).children(':first').val();

                var new_text = $(this).children(':first').find("option[value='"+new_val+"']").text();

                $(this).attr('sel-val', new_val);

                $(this).text(new_text);

            }else{

                var orgin_value = $(this).children().first().val();

                $(this).text(orgin_value);

            }

        }

    });

}

function CheckAll(mode, tb){

    if($(mode).hasClass('editing')){

        $(tb).children().each(function(){

            var tr = $(this);

            var check_box = tr.children().first().find(':checkbox');

            if(check_box.prop('checked')){

            }else{

                check_box.prop('checked',true);

                RowIntoEdit(tr);

            }

        });

    }else{

        $(tb).find(':checkbox').prop('checked', true);

    }

}

function CheckReverse(mode, tb){

    if($(mode).hasClass('editing')){

        $(tb).children().each(function(){

            var tr = $(this);

            var check_box = tr.children().first().find(':checkbox');

            if(check_box.prop('checked')){

                check_box.prop('checked',false);

                RowOutEdit(tr);

            }else{

                check_box.prop('checked',true);

                RowIntoEdit(tr);

            }

        });

    }else{

        //

        $(tb).children().each(function(){

            var tr = $(this);

            var check_box = tr.children().first().find(':checkbox');

            if(check_box.prop('checked')){

                check_box.prop('checked',false);

            }else{

                check_box.prop('checked',true);

            }

        });

    }

}

function CheckCancel(mode, tb){

    if($(mode).hasClass('editing')){

        $(tb).children().each(function(){

            var tr = $(this);

            var check_box = tr.children().first().find(':checkbox');

            if(check_box.prop('checked')){

                check_box.prop('checked',false);

                RowOutEdit(tr);

            }else{

            }

        });

    }else{

        $(tb).find(':checkbox').prop('checked', false);

    }

}

function EditMode(ths, tb){

    if($(ths).hasClass('editing')){

        $(ths).removeClass('editing');

        $(tb).children().each(function(){

            var tr = $(this);

            var check_box = tr.children().first().find(':checkbox');

            if(check_box.prop('checked')){

                RowOutEdit(tr);

            }else{

            }

        });

    }else{

        $(ths).addClass('editing');

        $(tb).children().each(function(){

            var tr = $(this);

            var check_box = tr.children().first().find(':checkbox');

            if(check_box.prop('checked')){

                RowIntoEdit(tr);

            }else{

            }

        });

    }

}

    </script>

</body>

</html>

示例：编辑框