菜鸟教程在线编辑器

 
                <!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
</head>
<body>

<p>在页面中查找所有框架的数量，然后修改 iframe 元素的 src 属性为 "https://www.runoob.com":</p>

<button onclick="myFunction()">点我</button>
<br><br>

<iframe src="https://m.runoob.com"></iframe>
<iframe src="https://www.taobao.com"></iframe>
<iframe src="https://c.runoob.com"></iframe>

<script>
function myFunction() {
    var frames = window.frames;
    var i;

    for (i = 0; i < frames.length; i++) {
        frames[i].location = "https://www.runoob.com";
    }
}
</script>

</body>
</html>
              