饭桶教程-在线编辑器

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>饭桶教程(kuaikuaixuan.com)</title> 
<script>
function changeStyle(){
    var x=document.getElementById("myframe");
    var y=(x.contentWindow || x.contentDocument);
    if (y.document)y=y.document;
    y.body.style.backgroundColor="#0000ff";
}
</script>
</head>
<body>
    
<iframe id="myframe" src="demo_iframe.htm">
<p>你的浏览器不支持iframes。</p>
</iframe>
<br><br>
<input type="button" onclick="changeStyle()" value="修改背景颜色">
​
</body>
</html>
​