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老师批语：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>点击随机产生背景色</title>
</head>
<body>
<button onclick="beijingColor()">随机产生背景色</button>
<script type="text/javascript">
function beijingColor()
{
var bg = document.getElementsByTagName("body")[0];
var r = Math.round(Math.random() * 255);
var g = Math.round(Math.random() * 255);
var b = Math.round(Math.random() * 255);
var co = "rgb(" + r + "," + g + "," + b + ")";
bg.style.background = co;
}
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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