11.vue 数据交互
vue
new Vue({
el,选择器 string/obj 不能选择html/body
data,
methods,
template string/obj
//生命周期 —— 虚拟DOM
1、初始化
beforeCreate
created
2、渲染
beforeMount
mounted
3、更新
beforeUpdate
updated
4、销毁
beforeDestroy
destroyed
});
指令：v-model/text/html/bind/for/if/show
v-model 绑定数据 数据来源
v-text 纯文本 简写 {{v-model/data}}
bind 绑定属性
v-bind:属性名="'值'" 简写 :属性名="'值'"
v-bind="json/{...}"
v-on:事件="事件函数 --- methods"
@事件="事件函数"
v-for="v,k,i in/of arr/json"
v-show 样式
v-if dom节点
交互
ajax fetch vue-resource axios
fetch使用方式
get:
fetch(url).then(res=>{
return res.text()/res.json();
}).then(data=>{
}).catch(err=>{
});
fetch(url).then(res=>{
if(res.ok){//true/false
res.text()/res.json().then(data=>{
});
}
}).catch(err=>{
});
res.text()/res.json();返回的都是promise对象
exp:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
</style>
<script>
window.onload = function(){
let oBtn = document.getElementById("btn1");
oBtn.onclick = function(){
let url = "get.php?a=1&b=2";
fetch(url).then(res=>{
return res.text();
}).then(data=>{
console.log("get:",data);
});
};
};
</script>
</head>
<body>
<div id="app">
<input id="btn1" type="button" value="按钮">
</div>
</body>
</html>
post:
fetch(url,{
method:"post",
headers:{
"content-type":"application/x-www-form-urlencoded"
},
body:"name=value&name=value"/ new URLSearchParams()
})
exp:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
</style>
<script>
window.onload = function(){
let oBtn = document.getElementById("btn1");
oBtn.onclick = function(){
let url = "post.php";//?a=1&b=2
fetch(url,{
method:"post",
headers:{
"content-type":"application/x-www-form-urlencoded"
},
body:"a=1&b=2"
}).then(res=>{
return res.text();
}).then(data=>{
console.log("post:",data);
});
};
};
</script>
</head>
<body>
<div id="app">
<input id="btn1" type="button" value="按钮">
</div>
</body>
</html>
fech跨域
https://www.npmjs.com/package/fetch-jsonp
exp:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
</style>
<script src="fetch-jsonp.js"></script>
<script>
window.onload = function(){
let oBtn = document.getElementById("btn1");
oBtn.onclick = function(){
let url = "https://sp0.baidu.com/5a1Fazu8AA54nxGko9WTAnF6hhy/su?wd=aaa";
fetchJsonp(url,{
jsonpCallback: 'cb',
jsonpCallbackFunction: 'xxx'
}).then(function(res) {
return res.json()
}).then(function(json) {
console.log('parsed json', json)
}).catch(function(err) {
console.log('parsing failed', err)
})
};
};
</script>
</head>
<body>
<div id="app">
<input id="btn1" type="button" value="按钮">
</div>
</body>
</html>
vue-resource/axios
get:
vm.$http.get(url,{params:{}}).then(res=>{
res.body/bodyText/data
}).catch;
post:
vm.$http.post(url,{},{emulateJSON:true}).then(res=>{
res.body/bodyText/data
}).catch;
jsonp:
vm.$http.jsonp(url,{params:{},jsonp:"cb"}).then(res=>{
res.body/bodyText/data
}).catch;
exp:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<script src="vue.js"></script>
<script src="vue-resource.js"></script>
<script>
window.onload = function(){
let vm = new Vue({
el:"#app",
data:{
},
methods:{
get(){
//get(url,{params:{xxx}}).then.catch;
let url = "get.php"
this.$http.get(url,{params:{a:1,b:1}}).then(res=>{
//res.body/bodyText/data
console.log(1,res.data);
}).catch(err=>{
console.log(2,err);
});
},
post(){
let url = "post.php"
this.$http.post(url,{a:1,b:1},{emulateJSON:true}).then(res=>{
//res.body/bodyText/data
console.log(1,res.data);
}).catch(err=>{
console.log(2,err);
});
},
jsonp(){
let url = "https://sp0.baidu.com/5a1Fazu8AA54nxGko9WTAnF6hhy/su"
this.$http.jsonp(url,{params:{wd:"aaa"},jsonp:"cb"}).then(res=>{
//res.body/bodyText/data
console.log(1,res.data.s);
}).catch(err=>{
console.log(2,err);
});
}
}
});
};
</script>
</head>
<body>
<div id="app">
<input @click="get" type="button" value="get"/>
<input @click="post" type="button" value="post"/>
<input @click="jsonp" type="button" value="jsonp"/>
</div>
</body>
</html>
axios:
get:
axios.get(url,{params:{}}).then(res=>{
res.data
}).catch;
post:
axios.post(url,{}/"name=value&name=value").then(res=>{
res.data
}).catch;
exp:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<script src="vue.js"></script>
<script src="axios.js"></script>
<script>
window.onload = function(){
let vm = new Vue({
el:"#app",
data:{
},
methods:{
get(){
//get(url,{params:{xxx}}).then.catch;
let url = "get.php";
axios.get(url,{params:{a:11,b:11}}).then(res=>{
console.log(1,res.data);
}).catch(err=>{
console.log(2,err);
});
},
post(){
//let url = "post.php";
let url = "http://localhost:3000/"
axios.post(url,{a:1,b:2}).then(res=>{
//axios.post(url,"a=11&b=11").then(res=>{
console.log(1,res.data);
}).catch(err=>{
console.log(2,err);
});
}
}
});
};
</script>
</head>
<body>
<div id="app">
<input @click="get" type="button" value="get"/>
<input @click="post" type="button" value="post"/>
</div>
</body>
</html>
跨域：
推荐用模块 cors
https://www.npmjs.com/package/cors
app.use(cors());
exp:
app.js:
var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var cors = require('cors')
var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var app = express();
app.use(cors());
/*app.use(function(req,res,next){
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "Content-Type,Content-Length, Authorization, Accept,X-Requested-With");
res.header("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS");
res.header("X-Powered-By",' 3.2.1')
next();
});*/
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');
app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use('/', indexRouter);
app.use('/users', usersRouter);
// catch 404 and forward to error handler
app.use(function(req, res, next) {
next(createError(404));
});
// error handler
app.use(function(err, req, res, next) {
// set locals, only providing error in development
res.locals.message = err.message;
res.locals.error = req.app.get('env') === 'development' ? err : {};
// render the error page
res.status(err.status || 500);
res.render('error');
});
module.exports = app;
index.js:
var express = require('express');
var router = express.Router();
/* GET home page. */
router.post('/', function(req, res, next) {
console.log(req.body);
let {a,b} = req.body;
res.send({type:"post",res:a + b});
});
module.exports = router;
案例：
微博评论：
1、weibo_axios.html:
axios交互：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>微博ajax接口测试</title>
<link href="style/weibo.css" rel="stylesheet" />
<script src="vue.js"></script>
<script src="axios.js"></script>
<script>
window.onload = function(){
let url = "weibo.php";
let vm = new Vue({
el:".app",
data:{
iNow:1,
msg:"abc",
arr:[],
pageCount:1,
},
methods:{
formatTime(iS){
let oDate = new Date(iS*1000);
return [
oDate.getFullYear(),"年",
oDate.getMonth()+1,"月",
oDate.getDate(),"日",
" ",
oDate.getHours(),"时",
oDate.getMinutes(),"分",
oDate.getSeconds(),"秒"
].join("")
},
/*weibo.php?act=add&content=xxx 添加一条
返回：{error:0, id: 新添加内容的ID, time: 添加时间}
*/
addMsg(){
axios.get(url,{params:{act:"add",content:this.msg}}).then(res=>{
console.log(res);
this.getPageData(this.iNow);
this.getPageCount();
});
},
/*weibo.php?act=get&page=1 获取一页数据
返回：[{id: ID, content: "内容", time: 时间戳, acc: 顶次数, ref: 踩次数}, {...}, ...]*/
getPageData(page){
this.iNow = page;
axios.get(url,{params:{act:"get",page}}).then(res=>{
//console.log(res);
this.arr = res.data;
});
},
/*weibo.php?act=get_page_count 获取页数
返回：{count:页数}*/
getPageCount(){
axios.get(url,{params:{act:"get_page_count"}}).then(res=>{
console.log(res.data.count);
this.pageCount = res.data.count;
});
},
/*weibo.php?act=del&id=12 删除一条数据
返回：{error:0}*/
del(id){
axios.get(url,{params:{act:"del",id}}).then(res=>{
console.log(res.data);
this.getPageData(this.iNow);
this.getPageCount();
});
},
/*weibo.php?act=acc&id=12 顶某一条数据
返回：{error:0}*/
acc(item){
let id = item.id;
axios.get(url,{params:{act:"acc",id}}).then(res=>{
console.log(res.data);
if(res.data.error == 0){//顶成功了
item.acc++;
console.log(item.acc);
}
});
},
ref(item){}
}
});
vm.getPageData(vm.iNow);
vm.getPageCount();
};
</script>
</head>
<body>
<div class="app">
<!--留言-->
<div class="takeComment">
<textarea v-model="msg" name="textarea" class="takeTextField" id="tijiaoText"></textarea>
<div class="takeSbmComment">
<input @click="addMsg" id="btn_send" type="button" class="inputs" value="" />
</div>
</div>
<!--已留-->
<div class="commentOn">
<div class="noContent" v-show="arr.length==0">暂无留言</div>
<div id="messList" class="messList">
<div class="reply" v-for="item in arr">
<p class="replyContent">{{item.content}}</p>
<p class="operation">
<span class="replyTime">{{formatTime(item.time)}}</span>
<span class="handle">
<a href="javascript:;" class="top" @click="acc(item)">{{item.acc}}</a>
<a href="javascript:;" class="down_icon" @click="ref(item.id)">{{item.ref}}</a>
<a href="javascript:;" class="cut" @click="del(item.id)">删除</a>
</span>
</p>
</div>
</div>
<div id="page" class="page">
<a @click="getPageData(item)" v-for="item in pageCount" href="javascript:;" :class="iNow==item?'active':''">{{item}}</a>
<!--<a href="javascript:;" class="active">1</a>
<a href="javascript:;">2</a>
<a href="javascript:;">3</a>-->
</div>
</div>
</div>
</body>
</html>
2、weibo_fetch.html:
fetch交互
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>微博ajax接口测试</title>
<link href="style/weibo.css" rel="stylesheet" />
<script src="vue.js"></script>
<script>
window.onload = function(){
let url = "weibo.php";
let vm = new Vue({
el:".app",
data:{
iNow:1,
msg:"abc",
arr:[],
pageCount:1,
},
methods:{
formatTime(iS){
let oDate = new Date(iS*1000);
return [
oDate.getFullYear(),"年",
oDate.getMonth()+1,"月",
oDate.getDate(),"日",
" ",
oDate.getHours(),"时",
oDate.getMinutes(),"分",
oDate.getSeconds(),"秒"
].join("")
},
/*weibo.php?act=add&content=xxx 添加一条
返回：{error:0, id: 新添加内容的ID, time: 添加时间}
*/
addMsg(){
fetch(url+'?act=add&content='+this.msg).then(res=>{
console.log(1,res);
return res.json();
}).then(res=>{
console.log(2,res);
this.getPageData(this.iNow);
this.getPageCount();
});
},
/*weibo.php?act=get&page=1 获取一页数据
返回：[{id: ID, content: "内容", time: 时间戳, acc: 顶次数, ref: 踩次数}, {...}, ...]*/
getPageData(page){
this.iNow = page;
fetch(url+"?act=get&page="+page).then(res=>{
return res.json();
}).then(res=>{
console.log(3,res);
this.arr = res;
});
},
/*weibo.php?act=get_page_count 获取页数
返回：{count:页数}*/
getPageCount(){
fetch(url+"?act=get_page_count").then(res=>{
return res.json();
}).then(res=>{
console.log(4,res);
this.pageCount = res;
});
},
/*weibo.php?act=del&id=12 删除一条数据
返回：{error:0}*/
del(id){
let that = this;
fetch(url+"?act=del&id="+id).then(res=>{
return res.json();
}).then(res=>{
console.log(res);
that.getPageData(that.iNow);
that.getPageCount();
});
},
/*weibo.php?act=acc&id=12 顶某一条数据
返回：{error:0}*/
acc(item){
let id = item.id;
fetch(url+"?act=acc&id="+id).then(res=>{
return res.json();
}).then(res=>{
console.log(res);
if(res.error == 0){//顶成功了
item.acc++;
console.log(item.acc);
}
});
},
/*weibo.php?act=ref&id=12 踩某一条数据
返回：{error:0}*/
ref(item){
let id = item.id;
fetch(url+"?act=ref&id="+id).then(res=>{
return res.json();
}).then(res=>{
console.log(res);
if(res.error == 0){//踩成功了
item.ref++;
console.log(item.ref);
}
});
}
}
})
vm.getPageData(vm.iNow);
vm.getPageCount();
}
</script>
</head>
<body>
<div class="app">
<!--留言-->
<div class="takeComment">
<textarea v-model="msg" name="textarea" class="takeTextField" id="tijiaoText"></textarea>
<div class="takeSbmComment">
<input @click="addMsg" id="btn_send" type="button" class="inputs" value="" />
</div>
</div>
<!--已留-->
<div class="commentOn">
<div class="noContent" v-show="arr.length==0">暂无留言</div>
<div id="messList" class="messList">
<div class="reply" v-for="item in arr">
<p class="replyContent">{{item.content}}</p>
<p class="operation">
<span class="replyTime">{{formatTime(item.time)}}</span>
<span class="handle">
<a href="javascript:;" class="top" @click="acc(item)">{{item.acc}}</a>
<a href="javascript:;" class="down_icon" @click="ref(item)">{{item.ref}}</a>
<a href="javascript:;" class="cut" @click="del(item.id)">删除</a>
</span>
</p>
</div>
</div>
<div id="page" class="page">
<a @click="getPageData(item)" v-for="item in pageCount" href="javascript:;" :class="iNow==item?'active':''">{{item}}</a>
<!--<a href="javascript:;" class="active">1</a>
<a href="javascript:;">2</a>
<a href="javascript:;">3</a>-->
</div>
</div>
</div>
</body>
</html>
weibo.php
<?php
/*
**********************************************
usage:
weibo.php?act=add&content=xxx 添加一条
返回：{error:0, id: 新添加内容的ID, time: 添加时间}
weibo.php?act=get_page_count 获取页数
返回：{count:页数}
weibo.php?act=get&page=1 获取一页数据
返回：[{id: ID, content: "内容", time: 时间戳, acc: 顶次数, ref: 踩次数}, {...}, ...]
weibo.php?act=acc&id=12 顶某一条数据
返回：{error:0}
weibo.php?act=ref&id=12 踩某一条数据
返回：{error:0}
weibo.php?act=del&id=12 删除一条数据
返回：{error:0}
注意： 服务器所返回的时间戳都是秒（JS是毫秒）
**********************************************
*/
//创建数据库之类的
$db=@mysql_connect('localhost', 'root', '') or @mysql_connect('localhost', 'root', 'root');
mysql_query("set names 'utf8'");
mysql_query('CREATE DATABASE ajax');
mysql_select_db('ajax');
$sql= <<< END
CREATE TABLE `ajax`.`weibo` (
`ID` INT NOT NULL AUTO_INCREMENT PRIMARY KEY ,
`content` TEXT NOT NULL ,
`time` INT NOT NULL ,
`acc` INT NOT NULL ,
`ref` INT NOT NULL
) CHARACTER SET utf8 COLLATE utf8_general_ci
END;
mysql_query($sql);
//正式开始
//header('Content-type:xmg/json');
$act=$_GET['act'];
$PAGE_SIZE=6;
switch($act)
{
case 'add':
$content=urldecode($_GET['content']);
$time=time();
$content=str_replace("\n", "", $content);
$sql="INSERT INTO weibo (ID, content, time, acc, ref) VALUES(0, '{$content}', {$time}, 0, 0)";
mysql_query($sql);
$res=mysql_query('SELECT LAST_INSERT_ID()');
$row=mysql_fetch_array($res);
$id=(int)$row[0];
echo "{\"error\": 0, \"id\": {$id}, \"time\": {$time}}";
break;
case 'get_page_count':
$sql="select ceil(n) from (SELECT COUNT(*)/{$PAGE_SIZE} n FROM weibo) a";
mysql_query($sql);
$res=mysql_query($sql);
//echo $res;
$row=mysql_fetch_array($res);
$count=(int)$row[0];
echo "{\"count\": {$count}}";
break;
case 'get':
$page=(int)$_GET['page'];
if($page<1)$page=1;
$s=($page-1)*$PAGE_SIZE;
$sql="SELECT ID, content, time, acc, ref FROM weibo ORDER BY time DESC LIMIT {$s}, {$PAGE_SIZE}";
$res=mysql_query($sql);
$aResult=array();
while($row=mysql_fetch_array($res))
{
$arr=array();
array_push($arr, '"id":'.$row[0]);
array_push($arr, '"content":"'.$row[1].'"');
array_push($arr, '"time":'.$row[2]);
array_push($arr, '"acc":'.$row[3]);
array_push($arr, '"ref":'.$row[4]);
array_push($aResult, implode(',', $arr));
}
if(count($aResult)>0)
{
echo '[{'.implode('},{', $aResult).'}]';
}
else
{
echo '[]';
}
break;
case 'acc':
$id=(int)$_GET['id'];
$res=mysql_query("SELECT acc FROM weibo WHERE ID={$id}");
$row=mysql_fetch_array($res);
$old=(int)$row[0]+1;
$sql="UPDATE weibo SET acc={$old} WHERE ID={$id}";
mysql_query($sql);
echo '{"error":0}';
break;
case 'ref':
$id=(int)$_GET['id'];
$res=mysql_query("SELECT ref FROM weibo WHERE ID={$id}");
$row=mysql_fetch_array($res);
$old=(int)$row[0]+1;
$sql="UPDATE weibo SET ref={$old} WHERE ID={$id}";
mysql_query($sql);
echo '{"error":0}';
break;
case 'del':
$id=(int)$_GET['id'];
$sql="DELETE FROM weibo WHERE ID={$id}";
//echo $sql;exit;
mysql_query($sql);
echo '{"error":0}';
break;
}
?>
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