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js如何判断 iframe 是否完全加载

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Release: 2016-06-01 09:54:46
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<code class="language-javascript">var iframe = document.createElement("iframe"); 
iframe.src = "http://www.manongjc.com"; 

if (!/*@cc_on!@*/0) { //if not IE 
iframe.onload = function(){ 
alert("Local iframe is now loaded."); 
}; 
} else { 
iframe.onreadystatechange = function(){ 
if (iframe.readyState == "complete"){ 
alert("Local iframe is now loaded."); 
} 
}; 
} 
document.body.appendChild(iframe); </code>
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最近, Nicholas C. Zakas 文章《Iframes, onload, and document.domain》的评论中 Christopher 提供了一个新的判断方法(很完美):

<code class="language-javascript">var iframe = document.createElement("iframe"); 
iframe.src = "http://manongjc.com"; 
if (iframe.attachEvent){ 
iframe.attachEvent("onload", function(){ 
alert("Local iframe is now loaded."); 
}); 
} else { 
iframe.onload = function(){ 
alert("Local iframe is now loaded."); 
}; 
} 
document.body.appendChild(iframe); </code>
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几点补充说明: 

  1. IE 支持 iframe 的 onload 事件,不过是隐形的,需要通过 attachEvent 来注册。 
  2. 第二种方法比第一种方法更完美,因为 readystatechange 事件相对于 load 事件有一些潜在的问题。

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