HTML5 postMessage
在HTML5中新增了postMessage方法，postMessage可以实现跨文档消息传输（Cross Document Messaging），Internet Explorer 8, Firefox 3, Opera 9, Chrome 3和 Safari 4都支持postMessage。可以通过绑定window的message事件来监听发送跨文档消息传输内容。示例代码如下：
eg.) parent page
<!DOCTYPE HTML><html><head><title>Communication</title><script> var messageChange = function(e) { var data = e.data; var origin = e.origin; if (origin !== "http://www.example.org") return; document.getElementById('display').innerHTML = data; }; if (typeof window.addEventListener != 'undefined') { window.addEventListener('message', messageChange, false); } else if (typeof window.attachEvent != 'undefined') { window.attachEvent('onmessage', messageChange); }</script></head><body><div id="display">Say something!</div><iframe scrolling="no" frameborder="0" width="0" height="0" src="http://www.example.org/html5/postMessage/sub.html"></iframe></body></html> eg.) sob page
<!DOCTYPE HTML><html><head><title>Communication</title><script>setInterval(function(){ window.parent.postMessage("hello world!", "http://www.example.org");},1000);</script></head><body></body></html>
DEMO见附件， 更多HTML5相关demo地址：http://html5demos.com/
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