iframe 跨域
本地建立两个域 www.site1.com 和 www.site2.com
一、同域交互
site1/iframe/index.html 和 site1/iframe/index2.html
index.html：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>site1-index</title>
<script>
function fMain(){
console.log('from site-index');
}
function exec_iframe(){
window.myframe.fIframe();
}
</script>
</head>
<body>
<p>site1-index</p>
<input type="button" value="调用site1-index2" onclick="exec_iframe()">
<br /><br />
<iframe src="http://www.site2.com/iframe/index2.html" name="myframe" width="500" height="100" frameborder="1"></iframe>
</body>
</html>
index2.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>site1-index2</title>
<script type="text/javascript">
function fIframe(){
console.log('from site1-index2');
}
function exec_main(){
parent.fMain();
}
</script>
</head>
<body>
<p>site1-index2</p>
<input type="button" value="调用site1-index" onclick="exec_main()">
</body>
</html>
访问 http://www.site1.com/iframe/index.html
二、跨域交互
如果按照同域交互的方法把 iframe 的 src 改为 http://www.site2.com/iframe/index.html，则会报错：
具体实现：
site1/iframe/index3.html：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>site1-index3</title>
<script>
function fMain(){
console.log('from site1-index3');
}
function exec_iframe(){
if(typeof(exec_obj)=='undefined'){
exec_obj = document.createElement('iframe');
exec_obj.name = 'tmp_frame';
exec_obj.src = 'http://www.site2.com/iframe/execB.html';
exec_obj.style.display = 'none';
document.body.appendChild(exec_obj);
}else{
exec_obj.src = 'http://www.site2.com/iframe/execB.html?' + Math.random();
}
}
</script>
</head>
<body>
<p>site1-index3</p>
<input type="button" value="调用site2-index2" onclick="exec_iframe()">
<br /><br />
<iframe src="http://www.site2.com/iframe/index2.html" name="myframe" width="500" height="100" frameborder="1"></iframe>
</body>
</html>
site1/iframe/execA.html：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<script type="text/javascript">
parent.parent.fMain();
</script>
<body>
</body>
</html>
site2/iframe/index2.html：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>site2-index2</title>
<script>
function fIframe(){
console.log('from site2-index2');
}
function exec_main(){
if(typeof(exec_obj)=='undefined'){
exec_obj = document.createElement('iframe');
exec_obj.name = 'tmp_frame';
exec_obj.src = 'http://www.site1.com/iframe/execA.html';
exec_obj.style.display = 'none';
document.body.appendChild(exec_obj);
}else{
exec_obj.src = 'http://www.site1.com/iframe/execA.html?' + Math.random();
}
}
</script>
</head>
<body>
<p><input type="button" value="调用site1-index3" onclick="exec_main()"></p>
</body>
</html>
site2/iframe/execB.html：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<script type="text/javascript">
parent.window.myframe.fIframe();
</script>
<body>
</body>
</html>
访问 http://www.site2.com/iframe/index3.html
参考：
