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我在一个基本的 HTML/Javascript 类中，我无法弄清楚如何“修改以下 JavaScript，以便它在每次调用时随机选择一个样式类”。下面的代码有效，但不是随机的。任何的意见都将会有帮助。先感谢您！

<html>

<head>
<title>HTML and JavaScript</title>
<link href="capstone.css" rel="stylesheet" type="text/css"></link>
<script>
var index = 0;

function stylize()
{
  index++;
  if (index > 7) index =1;
  var s = "myStyle" + index;
  var e = document.getElementById("MessageText");
  e.className = s;
  setTimeout("stylize()", 1500);
  return;
}
 </script>
 </head>

 <body onLoad="stylize()">
  <table align="center" border="1" bordercolor="black">
   <tr>
    <td align="center">
     <font size="3"><b>STYLE CLASS VIEWER</b></font>
    </td>
   </tr>
   <tr>
    <td align="center" height="100" width="400">
     <div id="MessageText" class="myStyle1">
      Hello World Wide Web!
     <div>
    </td>
   </tr>
  </table>
 </body>

</html>

我的 CSS 页面是：.....

.myStyle1 {font-family:Impact; color:black; font-size:100}
.myStyle2 {font-family:Georgia; color:black; font-size:18}
.myStyl31 {font-family:Tahoma; color:black; font-size:24}
.myStyle4 {font-family:Verdana; color:black; font-size:48}
.myStyle5 {font-family:Impact; color:red; font-size:30}
.myStyle6 {font-family:Marlett; color:green; font-size:65}
.myStyle7 {font-family:Arial; color:blue; font-size:46}
.myStyle8 {font-family:Courier Sans MS Bold; color:blue; font-size:60}
.myStyle9 {font-family:Impact; color:blue; font-size:35}
.myStyle10 {font-family:Arial Italic; color:blue; font-size:10}
.myStyle11 {font-family:Times New Roman; color:blue; font-size:50}
.myStyle12 {font-family:Tahoma; color:blue; font-size:38}
.myStyle13 {font-family:Verdana; color:white; font-size:30}
.myStyle14 {font-family:Marlett; color:blue; font-size:70}
.myStyle15 {font-family:Impact; color:blue; font-size:24}
.myStyle16 {font-family:Georgia; color:blue; font-size:24}
.myStyle17 {font-family:Impact; color:blue; font-size:35}
.myStyle18 {font-family:Georgia; color:black; font-size:12;}
.myStyle19 {font-family:Arial; color:blue; font-size:20;}
.myStyle20 {font-family:Tahoma; color:blue; font-size:55}
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1 回答 1

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如果您的代码正常工作，您所需要的只是其中的随机函数：

function getRandomInt (min, max) {
    return Math.floor(Math.random() * (max - min + 1)) + min;
}

做就是了：

index = getRandomInt(1, 20);

现在你会得到一个随机数。

于 2013-04-21T18:24:55.180 回答