var n = {1:100, 2:101, 3:102, 4:103}; 怎么获取这个对象n的长度呢? 方法一: function getLength(obj){ var count = 0; for(var i in n){ count++; } return count; } //改进 加上一个hasOwnProperty判断过滤下原型中的属性就比较安全了 function getLength(obj){ var count = 0; for(var i in n){ if(n.h
js数组长度,一般使用length 属性即可获取,但这个数组是个对象则只能使用以下方式 var t=typeof o; var length=0; if(t=='string'){ length=o.length; } else if(t=='object') { for(var index in o) { length++; } } 遍历数据则是当数据为对象时 var dataResultList=[]; for(var index in datalist){ dataResultList.p
关于js日期的获取要用到最基本的Date()方法获取当日的日期 var d =new Date(); //定义日期对象 var y=d.getFullYear(); //获取年 var m=d.getMonth()+1; //从 Date 对象返回月份 (0 ~ 11),所以要加1. var dd=d.getDate(); //获取日 获取小时,分钟,秒也是同理,一次获取.注:1秒=1000毫秒 <!DOCTYPE html> <html lang="en"&g
Learn how to create an Immutable.Map() through plain Javascript object construction and also via array tuples. console.clear(); // Can be an object var map = Immutable.Map({key: "value"}); console.log(map.get("key")); //"value&quo
Immutable.js offers methods to break immutable structures into subsets much like Array--for instance it has the all powerful slice()--and unlike Array it offers functional methods like take() and skip(). You get the best of both the imperative and fu
The Immutable.js Map() is analogous to a Javascript Object or Hash since it is comprised of key-value pairs. The Immutable.js List() is analogous to a Javascript Array and contains many of the same native methods. Let's compare the two and dive into
自己封装的一个js方法用于获取显示的星期和日期时间 /** * 获取用于显示的星期和日期时间 * @param date * @returns {string} */ function getWeek(date){ //将字符串日期转换日期对象 date = date.replace(/-/g, '/'); var dd = new Date(date); var curDate = new Date(); var curDate2 = new Date(); var m = dd.getMon
abel标签在JS和Jquery中使用不能像其他标签一样用value获取它的值,下面有个不错的示例,希望大家可以学习下 来源: < JS和Jquery获取和修改label的值的示例代码 > 获取值:label标签在JS和Jquery中使用不能像其他标签一样用value获取它的值: var label=document.getElementById("id"); var value=label.value; var label=document.getElementBy
JS加载获取父窗体传递的参数 $(document).ready(function () { var query = location.search.substring(1); var values = query.split("&"); for (var i = 0; i < values.length; i++) { var pos = values[i].indexOf('='); if (pos == -1) continue; var paramname = v
