html5跨域通信之postMessage的用法总结

日期:2021-01-20 类型:科技新闻 

关键词:微信公众号平台小程序,微信打分小程序,小程序发布,小程序大全,微信小程序编程

postMessagePortal.html 网页页面编码

拷贝编码
编码以下:

<!DOCTYPE html>
<title>题目</title>
<link rel="stylesheet" href="styles.css">
<link rel="icon" 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>跨域通信</h1>
传送信息内容:<input type="text" id="statusText" value="Online">
<button id="sendButton">明确</button>


<iframe id="widget" src="http://22527.vhost20.boxcdn.cn/postMessageWidget.html"></iframe>
<p>
<button id="stopButton">终止题目闪动</button>
</p>

postMessageWidget.html网页页面的编码

拷贝编码
编码以下:

<!DOCTYPE html>
<title>题目</title>
<link rel="stylesheet" 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>显示信息接受信息内容: <strong id="status"></strong><p>
<div>
<input type="text" id="messageText" value="填写信息內容">
<button id="actionButton">推送信息</button>
</div>