1.使用JSONP实现跨域
HTML代码
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<title>使用JSONP实现跨域</title>
</head>
<body>
<div class="container">
<ul class="news"></ul>
<button class="show">show news</button>
</div>
</body>
<script type="text/javascript">
$('.show').addEventListener('click',function(){
var script = document.createElement('script');
script.src='http://127.0.0.1:8080/getNews?callback=appendHtml';
document.head.appendChild(script);
document.head.removeChild(script);
})
function appendHtml(news){
var html = '';
for(var i = 0; i < news.length; i++){
html += '<li>' + news[i] + '</li>';
}
console.log(html);
$('.news').innerHTML = html;
}
function $(id){
return document.querySelector(id);
}
</script>
</html>
server.js
var http = require('http');
var fs = require('fs');
var path = require('path');
var url = require('url');
http.createServer(function(req,res){
var pathObj = url.parse(req.url,true);
switch (pathObj.pathname){
case '/getNews':
var news = [
"第11日前瞻：中国冲击4金 博尔特再战200米羽球",
"正直播柴飚/洪炜出战 男双力争会师决赛",
"女排将死磕巴西！郎平安排男陪练模仿对方核心"
];
res.setHeader('Content-Type','text/json;Charset=utf-8');
if(pathObj.query.callback){
res.end(pathObj.query.callback + '(' + JSON.stringify(news) + ')' );
}else{
res.end(JSON.stringify(news));
}
break;
default:
fs.readFile(path.join(__dirname,pathObj.pathname),function(e,data){
if(e){
res.writeHead(404,'not found');
res.end('<h1>404 Not Found</h1>');
}else{
res.end(data);
}
})
}
}).listen(8080);
2.使用CORS实现跨域
html代码
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<title>使用CORS实现跨域</title>
</head>
<body>
<div class="container">
<ul class="news"></ul>
<button class="show">show news</button>
</div>
</body>
<script type="text/javascript">
$('.show').addEventListener('click',function(){
var xhr = new XMLHttpRequest();
xhr.open('GET','http://127.0.0.1:8080/getNews',true);
xhr.send();
xhr.onload = function(){
appendHtml(JSON.parse(xhr.responseText));
}
})
function appendHtml(news){
var html = '';
for(var i = 0; i < news.length; i++){
html += '<li>' +news[i] + '</li>';
}
$('.news').innerHTML = html;
}
function $(selector){
return document.querySelector(selector);
}
</script>
</html>
server.js
var http = require('http');
var fs = require('fs');
var path = require('path');
var url = require('url');
http.createServer(function(req,res){
var pathObj = url.parse(req.url,true);
switch (pathObj.pathname){
case '/getNews':
var news = [
"第11日前瞻：中国冲击4金 博尔特再战200米羽球",
"正直播柴飚/洪炜出战 男双力争会师决赛",
"女排将死磕巴西！郎平安排男陪练模仿对方核心"
];
res.setHeader('Access-Control-Allow-Origin','http://localhost:8080');
//res.setHeader('Access-Control-Allow-Origin','*');
res.end(JSON.stringify(news));
break;
default:
fs.readFile(path.join(__dirname,pathObj.pathname),function(e,data){
if(e){
res.writeHead(404,'not found');
res.end('<h1>404 Not Found</h1>');
}else{
res.end(data);
}
})
}
}).listen(8080);
3.使用postMessage实现跨域
a.html
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<title>使用postMessage实现跨域</title>
<style type="text/css">
.ct{
width: 910px;
margin: auto;
}
.main{
float: left;
width: 450px;
height: 300px;
border: 1px solid #ccc;
}
.main input{
margin: 20px;
width: 200px;
}
.iframe{
float: right;
}
iframe{
width: 450px;
height: 300px;
border: 1px dashed #ccc;
}
</style>
</head>
<body>
<div class="ct">
<h1>使用postMessage实现跨域</h1>
<div class="main">
<input type="text" placeholder="http://a.jrg.com:8080/a.html">
</div>
<iframe src="http://localhost:8080/b.html" frameborder="0"></iframe>
</div>
</body>
<script type="text/javascript">
//URL http://a.jrg.com:8080/a.html
document.querySelector('.main input').addEventListener('input',function(){
console.log(this.value);
window.frames[0].postMessage(this.value,'*');
});
window.addEventListener('message',function(e){
$('.main input').value = e.data;
console.log(e.data);
})
function $(id){
return document.querySelector(id);
}
</script>
</html>
b.html
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<title>使用postMessage实现跨域</title>
<style type="text/css">
input{
margin: 20px;
width: 200px;
}
</style>
</head>
<body>
<input id="input" type="text" placeholder="http://b.com:8080/b.html">
</body>
<script type="text/javascript">
//URL http://b.jrg.com:8080/b.html
$('#input').addEventListener('input',function(){
window.parent.postMessage(this.value,'*');
});
window.addEventListener('message',function(e){
$('#input').value = e.data;
console.log(e.data);
})
function $(id){
return document.querySelector(id);
}
</script>
</html>
4.使用降域实现跨域
a.html
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<title>使用降域实现跨域</title>
<style type="text/css">
input{
margin: 20px;
width: 200px;
}
</style>
</head>
<body>
<div class="main">
<input type="text" placeholder="http://b.jrg.com:8080/b.html">
</div>
<iframe src="http://b.com:8080/b.html" frameborder="0"></iframe>
</body>
<script type="text/javascript">
//URL http://b.jrg.com:8080/b.html
document.querySelector('.main input').addEventListener('input',function(){
console.log(this.value);
window.frames[0].documentElement.querySelector('input').value = this.value;
});
document.domain = 'jrg.com';
</script>
</html>
b.html
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<title>使用降域实现跨域</title>
<style type="text/css">
.ct{
width: 910px;
margin: auto;
}
.main{
float: left;
width: 450px;
height: 300px;
border: 1px solid #ccc;
}
.main input{
margin: 20px;
width: 200px;
}
.iframe{
float: right;
}
iframe{
width: 450px;
height: 300px;
border: 1px dashed #ccc;
}
</style>
</head>
<body>
<div class="ct">
<h1>使用降域实现跨域</h1>
<div class="main">
<input type="text" placeholder="http://a.com:8080/a.html">
</div>
<iframe src="http://b.com:8080/b.html" frameborder="0"></iframe>
</div>
</body>
<script type="text/javascript">
//URL http://a.com:8080/a.html
document.querySelector('.main input').addEventListener('input',function(){
console.log(this.value);
window.frames[0].documentElement.querySelector('input').value = this.value;
});
document.domain = 'jrg.com';
</script>
</html>
