判断 iframe 是否加载完毕

我能想到的有以下几种方式：

方法一、jQuery load()

var frm = document.getElementById('myiframe');
$(frm).load(function(){                             //  等iframe加载完毕
dosomething();
});

 

方法二、onreadystatechange

var iframe = document.createElement("myiframe");
iframe.src = "http://www.baidu.com";
if (!/*@cc_on!@*/0) { //如果不是IE，IE的条件注释
    iframe.onload = function(){
        alert("Local iframe is now loaded.");
    };
} else {
    iframe.onreadystatechange = function(){ // IE下的节点都有onreadystatechange这个事件
        if (iframe.readyState == "complete"){
            alert("Local iframe is now loaded.");
        }
    };
}
document.body.appendChild(iframe);

方法三、attachEvent

var iframe = document.createElement("iframe");
iframe.src = "http://www.baidu.com";

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

document.body.appendChild(iframe);