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<html>3
<head>4
<meta charset="utf-8">5
<title>蜜蜂教程(mifengjc.com)</title>6
<script>7
function changeStyle() {8
var x = document.getElementById("myframe");9
var y = (x.contentWindow || x.contentDocument);10
if (y.document) y = y.document;11
y.body.style.backgroundColor = "#0000ff";12
}13
</script>14
</head>15
<body>16
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<iframe id="myframe" src="/examples/demo_iframe.htm">18
<p>你的浏览器不支持iframes。</p>19
</iframe>20
<br><br>21
<input type="button" onclick="changeStyle()" value="修改背景颜色">22
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</body>24
</html>