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  • 图片或banner的随机显示
  • 作者：未知 来源：未知 添加时间：2003年5月6日 字体:大 中 小
  • 80714如果你的主页中需要随机显示图片或者链接banner，你该怎么实现呢？
    C'YA+Mf

    C'YA+Mf
    下面是一个随机显示五条Banner的代码，你可以自己定义的。
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    <script language=javascript>
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    var m=5; //共几个Banner随机显示
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    var n=Math.floor(Math.random()*m+1)
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    switch(n)
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    {
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    case 1:
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    document.write('Banner1的HTML');
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    break;
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    case 2:
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    document.write('Banner2的HTML');
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    break;
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    case 3:
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    document.write('Banner3的HTML');
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    break;
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    case 4:
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    document.write('Banner4的HTML');
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    break;
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    case 5:
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    document.write('Banner5的HTML');
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    break;
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    }
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    </script></JS>
    C'YA+Mf

    C'YA+Mf
    如果一些如广告类的图片上需要加入相应的连接呢？那么代码仍然大同小异：
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    <JS>
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    <SCRIPT LANGUAGE="javascript">
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    <!-- Begin
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    var how_many_ads = 3;
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    var now = new Date()
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    var sec = now.getSeconds()
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    var ad = sec % how_many_ads;
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    ad +=1;
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    if (ad==1) {
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    txt="banner01";
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    url="http://www.chinavisual.com/banner01";;;
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    alt="banner01";
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    banner="image/banner01.gif";
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    width="468";
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    height="60";
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    }
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    if (ad==2) {
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    txt="banner02";
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    url="http://www.chinavisual.com/banner02";;;
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    alt="banner02";
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    banner="image/banner02.gif";
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    width="468";
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    height="60";
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    }
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    if (ad==3) {
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    txt="banner03";
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    url="http://www.chinavisual.com/banner03";;;
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    alt="banner03";
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    banner="image/banner03.gif";
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    width="468";
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    height="60";
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    }
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    document.write('<center>');
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    document.write('<a href="' + url + '" target="_top">');
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    document.write('<img src="' + banner + '" width=')
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    document.write(width + ' height=' + height + ' ');
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    document.write('alt="' + alt + '" border=0>
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    document.write('<small>' + txt + '</small></a>');
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    document.write('</center>');
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    // End -->
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    </SCRIPT>
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    C'YA+Mf

    C'YA+Mf
    这个其实不是绝对的随机显示，是读取当时系统时间的秒，然后求余，模拟的一个随机显示，不明白为什么网上有好多用这种方法，钟钟不赞成这种方法，因为取一个真正的随机数并不难。别外，最好用switch语句，用N条if语句显得有点儿笨。
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    80711
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