iframe的onload事件监听
 
iframe的onload事件监听比较麻烦，浏览器注册事件监听的方式也不一样，下面是一个通用的监听方式。
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
                "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
        <title></title>
</head>
<body>
<div id="cnt"></div>
<input name="bt" type="button" value="设置IFrame内容"
</body>
</html>
<script type='text/javascript'>
        //添加两个
        function doAction1() {
                alert("
        }
        function doAction2() {
                alert("
        }

        function doIt() {

                //删除所有的ifream内容
                var div = document.getElementById("cnt");
                var arrifm = div.getElementsByTagName("iframe");
                if (arrifm.length != 0) {
                        var x = div.removeChild(arrifm[0]);
                        alert("清除成功！")
                }

                //添加新的ifream内容
                var iframe = document.createElement("iframe");
                iframe.src = "b.html";

                //为ifream的
                if (iframe.attachEvent) {
                        iframe.attachEvent(" {
                                doAction1();
                                alert("Local iframe is now loaded 1.");
                        });
                } else {
                        iframe.onload = function() {
                                this.doAction2();
                                alert("Local iframe is now loaded 2.");
                        }
                }

                //追加ifream元素
                div.appendChild(iframe);
                //弹出ifream的HTML代码
//                alert(div.innerHTML);
        }
</script>
 
 
上面的事件监听写成下面的也行：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
                "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
        <title></title>
</head>
<body>
<div id="cnt"></div>
<input name="bt" type="button" value="设置IFrame内容"
</body>
</html>
<script type='text/javascript'>
        //添加两个
        function doAction1() {
                alert("
        }
        function doAction2() {
                alert("
        }

        function doIt() {

                //删除所有的ifream内容
                var div = document.getElementById("cnt");
                var arrifm = div.getElementsByTagName("iframe");
                if (arrifm.length != 0) {
                        var x = div.removeChild(arrifm[0]);
                        alert("清除成功！")
                }

                //添加新的ifream内容
                var iframe = document.createElement("iframe");
                iframe.src = "b.html";

                //为ifream的
                if (iframe.attachEvent) {
                        iframe.attachEvent(" doAction1);
                } else {
                        iframe.onload = doAction2
                }

                //追加ifream元素
                div.appendChild(iframe);
                //弹出ifream的HTML代码
//                alert(div.innerHTML);
        }
</script>
 
但是下面这种方式不行：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
                "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
        <title></title>
</head>
<body>
<div id="cnt"></div>
<input name="bt" type="button" value="设置IFrame内容" onclick="doIt()">
</body>
</html>
<script type='text/javascript'>
        function aa() {
                alert("aaaaaaaaa");
        }
        function doIt() {

                //删除所有的ifream内容
                var div = document.getElementById("cnt");
                var arrifm = div.getElementsByTagName("iframe");
                if (arrifm.length != 0) {
                        var x = div.removeChild(arrifm[0]);
                        alert("清除成功！")
                }

                //添加新的ifream内容
                var iframe = document.createElement("iframe");
                iframe.src = "b.html";

                //添加两个
                doIt.prototype.doAction1 = function() {
                        alert("onload1");
                        bb();
                };
                doIt.prototype.doAction2 = function() {
                        alert("onload2");
                        bb();
                };

                // 下面的方式不行
                if (iframe.attachEvent) {
                        iframe.attachEvent("onload", this.doAction1());
                } else {
                        iframe.onload = this.doAction2();
                }

                // 下面的方式不行
//                if (iframe.addEventListener) {
//                        iframe.addEventListener(' this.doAction1, false);
//                } else if (iframe.attachEvent) {
//                        iframe.onload = this.doAction2;
//                }


                //追加ifream元素
                div.appendChild(iframe);
                //弹出ifream的HTML代码
                alert(div.innerHTML);
        }

</script>
 
注意：父窗口不能调用ifream内的js方法。