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Practical exercise--js to transfer data between web pages

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Aug 10, 2018 pm 04:16 PM

1. It is estimated that few people know that there is a window.postMessage API in HTML5 APIS. The function of window.postMessage is to allow programmers to send data information between two windows/frames across domains. Basically, it's like cross-domain AJAX, but instead of interacting between the browser and the server, it communicates between two clients. Let’s take a look at how window.postMessage works. All browsers except IE6 and IE7 support this feature.

2. First create an index.html file. (When testing, you must use the server to test; file:// The beginning of the address is wrong and access is not allowed to send (because window.postMessageThis method is cross-domain tracking) ajax is almost so very similar))

<!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>Document</title>
    <style>
     body,p{
        margin: 0px;
        padding: 0px;
     }
    </style>
</head>
<body>
    
    <script>
        //弹出一个新窗口
        var domain = &#39;http://localhost:8080/chenzhenhua/&#39;;
        var myPopup = window.open(domain+&#39;lister.html&#39;,&#39;myWindow&#39;);//打开另一个网址
        //  var array=["100","liyoubing","200"];
        var array=[{"姓名":"李友冰"},{"性别":"男"}]

        //周期性的发送消息
        setInterval(function(){
           //var message = &#39;Hello!  The time is: &#39; + (new Date().getTime());
          //  console.log(&#39;blog.local:  sending message:  &#39; + message);
             //array:发送消息de数据,domain: 是url;
            myPopup.postMessage(array,domain);
        },6000);
    </script>
</body>
</html>

3. The code when creating the lister.html file is as follows:

<!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>Document</title>
</head>
<body>
    <script>
         //监听消息反馈
       window.addEventListener(&#39;message&#39;,function(event) {
            console.log(event);
            if(event.origin !== &#39;http://localhost:8080&#39;) return;
            console.log(&#39;received response:  &#39;,event.data);

        },false);
    </script>
</body>
</html>

4. The results are as follows:

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