判断 iframe 是否加载完成的完美方法（转）

般来说，我们判断 iframe 是否加载完成其实与判断 JavaScript 文件是否加载完成采用的方法很类似：

var iframe = document.createElement("iframe");iframe.src = "";if (!/*@cc_on!@*/0) { //if not IE iframe.onload = function(){ alert("Local iframe is now loaded."); };} else { iframe.onreadystatechange = function(){//ieif (iframe.readyState == "complete"){ alert("Local iframe is now loaded.");}};}document.body.appendChild(iframe);

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)

var iframe = document.createElement("iframe");iframe.src = "";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);