A common example is: there are multiple page styles on a site for viewers to choose from.
At the same time, after selecting a certain style, the style will still be maintained when the page is opened again.
Naturally, Cookie technology comes to mind
The following is the program code:
<HTML>
<HEAD>
<link ID=skin rel=stylesheet type=text/css>
<TITLE>Skin resurfacing technology</TITLE>
<SCRIPT LANGUAGE=javascript>
<!--
function SetCookie(name,value){
var argv=SetCookie.arguments;
var argc=SetCookie.arguments.length;
var expires=(2<argc)?argv[2]:null;
var path=(3<argc)?argv[3]:null;
var domain=(4<argc)?argv[4]:null;
var secure=(5<argc)?argv[5]:false;
document.cookie=name+=+escape(value)+((expires==null)?:(; expires=+expires.toGMTString()))+((path==null)?:(; path=+path) )+((domain==null)?:(; domain=+domain))+((secure==true)?; secure:);
}
function GetCookie(Name) {
var search = Name + =;
var returnvalue = ;
if (document.cookie.length > 0) {
offset = document.cookie.indexOf(search);
if (offset != -1) {
offset += search.length;
end = document.cookie.indexOf(;, offset);
if (end == -1)
end = document.cookie.length;
returnvalue=unescape(document.cookie.substring(offset,end));
}
}
return returnvalue;
}
var thisskin;
thisskin=GetCookie(nowskin);
if(thisskin!=)
skin.href=thisskin;
else
skin.href=css.css;
function changecss(url){
if(url!=){
skin.href=url;
var expdate=new Date();
expdate.setTime(expdate.getTime()+(24*60*60*1000*30));
//expdate=null;
//The following sets the COOKIES time to 1 year. You can set the time at will.
SetCookie(nowskin,url,expdate,/,null,false);
}
}
//-->
</SCRIPT>
</HEAD>
<BODY>
<P>Please select the drop-down menu below to test the skin resurfacing effect</P>
<a href=# onclick=changecss('css.css')>css.css</a>
<a href=# onclick=changecss('css1.css')>css1.css</a>
<a href=# onclick=changecss('css2.css')>css2.css</a>
<a href=# onclick=changecss('css3.css')>css3.css</a>
<br>
<select onchange=changecss(this.value)>
<option>Select stylesheet file</option>
<script language=javascript>
var csss=new Array();
csss[0]=css.css;
csss[1]=css1.css;
csss[2]=css2.css;
csss[3]=css3.css;
var i;
for(i=0;i<4;i++)
if(thisskin==csss[i])
document.write(<option value=/+csss[i]+/ selected>+csss[i]+style sheet file</option>);
else
document.write(<option value=/+csss[i]+/>+csss[i]+style sheet file</option>);
</script>
</select>
</BODY>
</HTML>