详解HTML5中的消息通信代码

2020-03-24 16:07:14

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HTML5支持跨文档消息通信(Cross-Document Messaging)。

既然使用到消息通信，那么必然有事件(event)产生。根据事件的产生和消费，我们能够找到发送者和接收者，也就是Sender和Listener。

其中Litener需要做如下的工作：

编写一个消息处理函数；

将消息处理函数注册：addEventListener( message , function, false);

其中Sender需要做以下工作：

postMessage( this is a message , http://www.VeVb.com

事件对象event中包含的成员包括：

data：传递的数据；

origin：origin，origin包括三要素：主机、协议、端口；

source：来源对象；

好了，下面我们看一个例子，这个例子展示了在页面中嵌套页面并且向子页面发送消息：

父页面如下：

 !DOCTYPE html  html lang= en  !--  crossDomain.html by Bill Weinman  http://bw.org/contact/  created 2011-04-16 Copyright (c) 2011 The BearHeart Group, LLC This file may be used for personal educational purposes as needed.  Use for other purposes is granted provided that this notice is retained and any changes made are clearly indicated as such.  head  title  HTML5 Messaging Template File (One) /title  link rel= stylesheet type= text/css href= ../CSS/main.css  style  #frameTwo { float: left; width: 500px; height: 400px; margin: 0 5px; padding: 3px; border-top: 2px solid #3c6b92; border-left: 2px solid #3c6b92; border-bottom: 2px solid #ccc; border-right: 2px solid #ccc; #content { height: 500px; } /style  script type= text/javascript  // 域名 var originTwo = http://two.3sn.net  // URL地址 var URLTwo = http://two.3sn.net/H5Msg/ExerciseFiles/Chap01/crossDomainTwo.html  var windowTwo = null; function handleMessage(event) { // 判断源区域 if (event.origin == originTwo) { if(!windowTwo) windowTwo = event.source; log( message from origin: + event.origin); log(event.data); // 发送消息 windowTwo.postMessage( this is from windowOne! , originTwo); log( message sent back to windowTwo  } else { dispError( message from untrusted origin: + event.origin);
 window.addEventListener( message , handleMessage, false); window.onerror = windowErrorHandler; log( this is windowOne  log( host: + location.host); // load two页面 element( frameTwo ).src = URLTwo; // load the frame // ##### Utilities ##### // shortcut for getElementById function element(id) { return document.getElementById(id); } function clearDisp() { element( pageResults ).innerHTML =  element( message ).innerHTML =  element( message ).className =  function dispMessage(message) { m = element( message  m.className = message  if(m.textContent.length 0) { m.innerHTML += br / + message; } else m.innerHTML = message; function windowErrorHandler(message, filename, lineno) { dispError(message + ( + filename + : + lineno + )  return true; function dispError(errorMessage) { element( pageResults ).innerHTML +=  errorMessage ? p > !DOCTYPE html  html lang= en  !--  crossDomain.html by Bill Weinman  http://bw.org/contact/  created 2011-04-16 Copyright (c) 2011 The BearHeart Group, LLC This file may be used for personal educational purposes as needed.  Use for other purposes is granted provided that this notice is retained and any changes made are clearly indicated as such.  head  title  HTML5 Messaging Template File (Two) /title  link rel= stylesheet type= text/css href= ../CSS/main.css  script type= text/javascript  var originOne = http://one.3sn.net  function handleMessage(event) { if (event.origin == originOne) { log( message from origin: + event.origin); log(event.data); } else { dispError( message from untrusted origin: + event.origin); // ##### Init ##### function init() { window.onerror = windowErrorHandler; // addEventListener doesn t provide the right error object in Firefox window.addEventListener( message , handleMessage, false); log( this is windowTwo  log( host: + location.host); var windowOne = parent; windowOne.postMessage( this is from windowTwo! , originOne); log( message sent to windowOne  // ##### Utilities ##### // shortcut for getElementById function element(id) { return document.getElementById(id); } function clearDisp() { element( pageResults ).innerHTML =  element( message ).innerHTML =  element( message ).className =  function dispMessage(message) { m = element( message  m.className = message  if(m.textContent.length 0) { m.innerHTML += br / + message; } else m.innerHTML = message; function windowErrorHandler(message, filename, lineno) { dispError(message + ( + filename + : + lineno + )  return true; function dispError(errorMessage) { element( pageResults ).innerHTML +=  errorMessage ? p >需要学习html5的同学请关注php html5视频教程，众多html5在线视频教程可以免费观看！
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