判断iframe加载完成

方法一：

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.");        }    };}

方法二：

if (iframe.attachEvent){    iframe.attachEvent("onload", function(){        alert("Local iframe is now loaded.");    });} else {    iframe.onload = function(){        alert("Local iframe is now loaded.");    };}