js下判断 iframe 是否加载完成的完美方法

var iframe = document.createElement("iframe");
iframe.src = "//www.VeVB.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);

var iframe = document.createElement("iframe");
iframe.src = "http://sc.VeVB.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);