点评：本文是对html5跨域通讯之postMessage的用法进行了详细的总结介绍，需要的朋友可以过来参考下，希望对大家有所帮助
postMessagePortal.html 页面代码
<!DOCTYPE html>
<title>标题</title>
<link href="styles.css">
<link href="http://apress.com/favicon.ico">
<script></p><p>var targetOrigin = "http://22527.vhost20.boxcdn.cn";</p><p>var defaultTitle = "Portal";
var notificationTimer = null;</p><p>function messageHandler(e) {
if (e.origin == targetOrigin) {
notify(e.data);
} else {
// ignore messages from other origins
}
}</p><p>function sendString(s) {
document.getElementById("widget").contentWindow.postMessage(s, targetOrigin);
}</p><p>
function notify(message) {
stopBlinking();
blinkTitle(message, defaultTitle);
}</p><p>function stopBlinking() {
if (notificationTimer !== null) {
clearTimeout(notificationTimer);
}
document.title = defaultTitle;
}</p><p>function blinkTitle(m1, m2) {
document.title = m1;
notificationTimer = setTimeout(blinkTitle, 1000, m2, m1)
}</p><p>function sendStatus() {
var statusText = document.getElementById("statusText").value;
sendString(statusText);
}</p><p>function loadDemo() {
document.getElementById("sendButton").addEventListener("click", sendStatus, true);
document.getElementById("stopButton").addEventListener("click", stopBlinking, true);
sendStatus();
}
window.addEventListener("load", loadDemo, true);
window.addEventListener("message", messageHandler, true);</p><p></script></p><p><h1>跨域通讯</h1>
传递信息：<input type="text" value="Online">
<button>确定</button>
<iframe src="http://22527.vhost20.boxcdn.cn/postMessageWidget.html"></iframe>
<p>
<button>停止标题闪烁</button>
</p>
postMessageWidget.html页面的代码
<!DOCTYPE html>
<title>标题</title>
<link href="styles.css">
<script></p><p>var targetOrigin = "http://www.weixiu0376.cn";</p><p>// TODO whitelist array</p><p>function messageHandler(e) {
if (e.origin === "http://www.weixiu0376.cn") {
document.getElementById("status").textContent = e.data;
} else {
// ignore messages from other origins
}
}</p><p>function sendString(s) {
window.top.postMessage(s, targetOrigin);
}</p><p>function loadDemo() {
document.getElementById("actionButton").addEventListener("click",
function() {
var messageText = document.getElementById("messageText").value;
sendString(messageText);
}, true);</p><p>}
window.addEventListener("load", loadDemo, true);
window.addEventListener("message", messageHandler, true);</p><p></script>
<p>显示接收信息: <strong></strong><p>
<div>
<input type="text" value="填写消息内容">
<button>发送消息</button>
</div>