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JavaScript 
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
  <TITLE> New Document </TITLE>
  <link rel="alternate stylesheet" href="red.css" type="text/css" title="red" media="screen, projection"/>
  <link rel="stylesheet" href="green.css" type="text/css" title="green" media="screen, projection"/>
  <link rel="alternate stylesheet" href="yellow.css" type="text/css" title="yellow" media="screen, projection"/>
  <script language="javascript">

function setActiveStyleSheet(title) {
var i, a, main;
if (title) {
for(i=0; (a = document.getElementsByTagName('link')[i]); i++) {
if(a.getAttribute('rel').indexOf('style') != -1 && a.getAttribute('title')) {
a.disabled = true;
if(a.getAttribute('title') == title){
a.disabled = false;
}

}
}
}
}
  function getActiveStyleSheet() {
var i, a;
for(i=0; (a = document.getElementsByTagName('link')[i]); i++) {
if(a.getAttribute('rel').indexOf('style') != -1 && a.getAttribute('title') && !a.disabled) return a.getAttribute('title');
}
return null;
   }

/*
function setActiveStyleSheet(title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName
  ("link")[i]); i++) {
if(a.getAttribute("rel").indexOf("style")
!= -1 && a.getAttribute("title")) {
a.disabled = true;
if(a.getAttribute("title") == title)
a.disabled = false;
}
}
}
function getActiveStyleSheet() {
var i, a;
for(i=0; (a = document.getElementsByTagName
("link")[i]); i++) {
if(a.getAttribute("rel").indexOf("style")
!= -1 && a.getAttribute("title") && !a.disabled)
return a.getAttribute("title");
}
return null;
}
function getPreferredStyleSheet() {
var i, a;
for(i=0; (a = document.getElementsByTagName
("link")[i]); i++) {
if(a.getAttribute("rel").indexOf("style") != -1
&& a.getAttribute("rel").indexOf("alt") == -1
&& a.getAttribute("title")
) return a.getAttribute("title");
}
return null;
}
function createCookie(name,value,days) {
if (days) {
var date = new Date();
date.setTime(date.getTime()+(days*24*60*60*1000));
var expires = "; expires="+date.toGMTString();
}
else expires = "";
document.cookie = name+"="+value+expires+";
path=/";
}
function readCookie(name) {
var nameEQ = name + "=";
var ca = document.cookie.split(';');
for(var i=0;i < ca.length;i++) {
var c = ca[i];
while (c.charAt(0)==' ') c = c.substring(1,c.length);
if (c.indexOf(nameEQ) == 0) return
c.substring(nameEQ.length,c.length);
}
return null;
}
window.onload = function(e) {
var cookie = readCookie("style");
var title = cookie ? cookie :
getPreferredStyleSheet();
setActiveStyleSheet(title);
}
window.onunload = function(e) {
var title = getActiveStyleSheet();
createCookie("style", title, 365);
}
var cookie = readCookie("style");
var title = cookie ? cookie :
getPreferredStyleSheet();
setActiveStyleSheet(title);*/
  </script>
</HEAD>

<BODY>
  <a href="javascript :void()" onClick="setActiveStyleSheet('red'); return false;" title="红色样式">红色样式</a>
<a href="javascript :void()" onClick="setActiveStyleSheet('green'); return false;" title="绿色样式">绿色样式</a>
<a href="javascript :void()" onClick="setActiveStyleSheet('yellow'); return false;" title="黄色样式">黄色样式</a>
<a href="javascript :void()" onClick="setActiveStyleSheet('none'); return false;" title="没有样式">没有样式</a>
</BODY>
</HTML>
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