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CrossOrigin-a.html
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CrossOrigin-a.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Cross-origin</title>
</head>
<body>
<iframe id="iframe" src="http://127.0.0.1:8081/CrossOrigin-b.html" style="display:none;"></iframe>
<script>
var iframe = document.getElementById('iframe');
// 向b.html传hash值
setTimeout(function () {
iframe.src = iframe.src + '#user=admin';
}, 1000);
// 开放给同域c.html的回调方法
function onCallback(res) {
console.log('data from c.html ---> ' + res);
}
</script>
<script>
var proxy = function (url, callback) {
var state = 0;
var iframe = document.createElement('iframe');
// 加载跨域页面
iframe.src = url;
iframe.style.display = 'none';
// onload事件会触发2次，第1次加载跨域页，并留存数据于window.name
iframe.onload = function () {
if (state === 0) {
// 第1次onload(跨域页)成功后，切换到同域代理页面
iframe.contentWindow.location = 'http://127.0.0.1:8080/CrossOrigin-c.html';
state = 1;
} else if (state === 1) {
// 第2次onload(同域proxy页)成功后，读取同域window.name中数据
callback(iframe.contentWindow.name);
destoryFrame();
}
};
document.body.appendChild(iframe);
// 获取数据以后销毁这个iframe，释放内存；这也保证了安全（不被其他域frame js访问）
function destoryFrame() {
iframe.contentWindow.document.write('');
iframe.contentWindow.close();
document.body.removeChild(iframe);
}
};
// 请求跨域b页面数据
proxy('http://127.0.0.1:8081/CrossOrigin-b.html', function (data) {
console.log(data);
});
proxy('http://127.0.0.1:8081/CrossOrigin-b.html', function (data) {
console.log(data);
});
</script>
</body>
</html>