一个有趣的JS：随机效果文本－定时的从一段文本中随机选择一个字符，改变颜色。可以学习一下JS。


答案：<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> 
<html> 
<head> 
<SCRIPT LANGUAGE="javascript"> 
<!-- 
function open () {return true;} 
//--> 
</SCRIPT> 
<title>Ripple Text Examples by Mark Boyle email mboil@hotmail.com</title> 
</head> 

<BODY bgcolor=green text="white" bgcolor="green" link="yellow" vlink="yellow"  
alink="red"> 
<font color="yellow"> 


<SCRIPT LANGUAGE="javascript"> 

var speed = 20; 
var fulltext; 

if(navigator.appName == "Netscape") 
document.write('<layer id="wds"></layer><br>'); 
if (navigator.appVersion.indexOf("MSIE") != -1) 
document.write('<span id="wds"></span><br>'); 


function livetext() 
{ 
fulltext="this is an example of random effect text" 
var whichchar=Math.round((Math.random()*fulltext.length)) 
switch(whichchar){ 
case 0: 
fulltext = '<font color="red">' + fulltext.substring(0,1) + '</font>' + fulltext.substring 
(1,fulltext.length); 
break; 
case fulltext.length: 
fulltext = fulltext.substring(0,fulltext.length-1) + '<font color="red">' + fulltext.substring 
(fulltext.length-1,fulltext.length) + '</font>'; 
break; 
default: 
fulltext =  
fulltext.substring(0,whichchar) + '<font color="violet">' + 
fulltext.substring(whichchar,whichchar+1) + '</font>' + 
fulltext.substring(whichchar+1,fulltext.length); 
break; 
} 
if(navigator.appName == "Netscape") { 
size = "<font point-size='25pt'>";  
document.wds.document.write(size+'<center>' + fulltext + '</center></font>'); 
document.wds.document.close(); 
} 
if (navigator.appVersion.indexOf("MSIE") != -1){ 
wds.innerHTML = '<center>' + fulltext + '</center><p>'; 
wds.style.fontSize='25px' 
   } 

setTimeout("livetext()",speed); 
} 

livetext() 

</script> 

</font> 

</BODY> 
</html>

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