拷贝下面的代码到你的html文件的<body>和</body>之间：
<script language="JavaScript"><!-- tips = new Array(4); tips[0] = "*相信明天一定比今天好*"; tips[1] = "*相信努力以赴必有收获*"; tips[2] = "*相信面对难关决不低头*"; tips[3] = "*相信风调雨顺国泰民安*"; index = Math.floor(Math.random() * tips.length); document.write("<center><p>" + tips[index] + "</center></p>"); // --></script>