<html>
<head>
<title>JS 随机图片效果</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<style type="text/css">
<!--
img { border: #999999; border-style: dotted; border-top-width: 1px; border-right-width: 1px; border-bottom-width: 1px; border-left-width: 1px}
-->
</style>
</head>
<SCRIPT LANGUAGE="JavaScript">
var rand1 = 0;
var useRand = 0;
images = new Array;
images[1] = new Image();
images[1].src = "demo1.png";
images[2] = new Image();
images[2].src = "demo2.png";
images[3] = new Image();
images[3].src = "demo3.png";
images[4] = new Image();
images[4].src = "demo4.png";
function swapPic() {
var imgnum = images.length - 1;
do {
var randnum = Math.random();
rand1 = Math.round((imgnum - 1) * randnum) + 1;
} while (rand1 == useRand);
useRand = rand1;
document.randimg.src = images[useRand].src;
}
</script>
<body bgcolor="#FFFFFF" text="#000000" OnLoad="swapPic()">
<img name="randimg" src="demo1.png">
</body>
</html>
效果图：