既然使用到消息通信，那么必然有事件(event)產生。根據事件的產生和消費，我們能夠找到發送者和接收者，也就是Sender和Listener。

其中Litener需要做如下的工作：

編寫一個消息處理函數；

將消息處理函數注冊：addEventListener( message , function, false);

其中Sender需要做以下工作：

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

事件對象event中包含的成員包括：

data：傳遞的數據；

origin：origin，origin包括三要素：主機、協議、端口；

source：來源對象；

好了，下面我們看一個例子，這個例子展示了在頁面中嵌套頁面并且向子頁面發送消息：

父頁面如下：

 !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) { // 判斷源區域 if (event.origin == originTwo) { if(!windowTwo) windowTwo = event.source; log( message from origin: + event.origin); log(event.data); // 發送消息 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頁面 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 >
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以上就是詳解HTML5中的消息通信代碼的詳細內容，其它編程語言        
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