javascript控制cookies及在跳出本页给出提示，是否放弃操作！！
1.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>
<script language="JavaScript">
function Setcookie(name, value) { //设置名称为name,值为value的Cookie
//var argc = SetCookie.arguments.length;
//var argv = SetCookie.arguments;
//var path = (argc > 3) ? argv[3] : null;
//var domain = (argc > 4) ? argv[4] : null;
//var secure = (argc > 5) ? argv[5] : false;
document.cookie = name + "=" + value;// +
//((path == null) ? "" : ("; path=" + path)) +
//((domain == null) ? "" : ("; domain=" + domain)) +
//((secure == true) ? "; secure" : "");
}
function Deletecookie(name) { //删除名称为name的Cookie
var exp = new Date();
exp.setTime (exp.getTime() - 1);
var cval = GetCookie (name);
document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}
function Clearcookie() //清除COOKIE
{
var temp=document.cookie.split(";");
var loop3;
var ts;
for (loop3=0;loop3<temp.length;loop++) {
ts=temp[loop3].split("=")[0];
if (ts.indexOf('mycat')!=-1)
DeleteCookie(ts); //如果ts含“mycat”则执行清除
}
}
function getCookieVal(offset) { //取得项名称为offset的cookie值
var endstr = document.cookie.indexOf (";", offset);
if (endstr == -1)
endstr = document.cookie.length;
return unescape(document.cookie.substring(offset, endstr));
}
function GetCookie(name) { //取得名称为name的cookie值
var arg = name + "=";
var alen = arg.length;
var clen = document.cookie.length;
var i = 0;
while (i < clen) {
var j = i + alen;
if (document.cookie.substring(i, j) == arg)
return getCookieVal (j);
i = document.cookie.indexOf(" ", i) + 1;
if (i == 0) break;
}
return null;
}
Setcookie("test","value!!!!!!!!");
alert(GetCookie("test"));
function cc()
{
/* check for a cookie */
if (document.cookie == "")
{
/* if a cookie is not found - alert user -
change cookieexists field value to false */
alert("COOKIES need to be enabled!");
/* If the user has Cookies disabled an alert will let him know
that cookies need to be enabled to log on.*/
document.Form1.cookieexists.value ="false"
} else {
/* this sets the value to true and nothing else will happen,
the user will be able to log on*/
document.Form1.cookieexists.value ="true"
}
}
/* Set a cookie to be sure that one exists.
Note that this is outside the function*/
document.cookie = 'killme' + escape('nothing')
</script>
<BODY onbeforeunload="RunOnBeforeUnload()" id="Posts">
<FORM Name="Form1" id="Form1">
<input type="text" name="cookieexists" value="false">
</FORM>
<a href="test.html">中微家校通</a>
</BODY>
</HTML>
<SCRIPT LANGUAGE="JavaScript">
<!--
g_blnCheckUnload = true;
function RunOnBeforeUnload()
{
if (g_blnCheckUnload)
{
window.event.returnValue = 你确是要放弃操作吗？';
}
}
//-->
</SCRIPT>
2.html（简单的操作cookies）
<html>
<head>
<title> 新文档 </title>
<meta name="Generator" content="EditPlus">
<meta name="Author" content="FlashSoft">
<meta name="Keywords" content="">
<meta name="Description" content="FlashSoft">
<meta http-equiv="Content-Type" content="text/html;charset=gb2312">
</head>
<body>
<script language="JavaScript" type="Text/JavaScript">
<!--
// 实在懒得写了,为了减少字节量
//添加和获得都已经写好了,删除,你只要把时间改为-1就可以了,懒得封装了,实在无意义[代码moz兼容,值得一提,moz跟ie不是一个地方存cookie的]
function Cookie(){
this.SetValue=function(name,value,hours,path,domain,secure){
var str=new String();
var nextTime=new Date();
nextTime.setHours(nextTime.getHours()+hours);
str=name+"="+escape(value);
if(hours)
str+=";expires="+nextTime.toGMTString();
if(path)
str+=";path="+path;
if(domain)
str+=";domain="+domain;
if(secure)
str+=";secure";
document.cookie=str;
}
this.GetValue=function(name){
var rs=new RegExp("(^|)"+name+"=([^;]*)(;|$)","gi").exec(document.cookie),tmp;
if(tmp=rs)
return unescape(tmp[2]);
return null;
}
}
var _c=new Cookie();
_c.SetValue("list1","啊",1);
_c.SetValue("list2","噢",1);
alert(_c.GetValue("list2"))
document.writeln(document.cookie);
//-->
</script>
</body>
</html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><HTML><HEAD><TITLE> New Document </TITLE><META NAME="Generator" CONTENT="EditPlus"><META NAME="Author" CONTENT=""><META NAME="Keywords" CONTENT=""><META NAME="Description" CONTENT=""></HEAD><script language="JavaScript">
function Setcookie(name, value) { //设置名称为name,值为value的Cookie 
//var argc = SetCookie.arguments.length; //var argv = SetCookie.arguments; //var path = (argc > 3) ? argv[3] : null; //var domain = (argc > 4) ? argv[4] : null; //var secure = (argc > 5) ? argv[5] : false; document.cookie = name + "=" + value;// + //((path == null) ? "" : ("; path=" + path)) + //((domain == null) ? "" : ("; domain=" + domain)) + //((secure == true) ? "; secure" : ""); } function Deletecookie(name) { //删除名称为name的Cookie var exp = new Date(); exp.setTime (exp.getTime() - 1); var cval = GetCookie (name); document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString(); } function Clearcookie() //清除COOKIE { var temp=document.cookie.split(";"); var loop3; var ts; for (loop3=0;loop3<temp.length;loop++) { ts=temp[loop3].split("=")[0]; if (ts.indexOf('mycat')!=-1) DeleteCookie(ts); //如果ts含“mycat”则执行清除 } } function getCookieVal(offset) { //取得项名称为offset的cookie值 var endstr = document.cookie.indexOf (";", offset); if (endstr == -1) endstr = document.cookie.length; return unescape(document.cookie.substring(offset, endstr)); } function GetCookie(name) { //取得名称为name的cookie值 var arg = name + "="; var alen = arg.length; var clen = document.cookie.length; var i = 0; while (i < clen) { var j = i + alen; if (document.cookie.substring(i, j) == arg) return getCookieVal (j); i = document.cookie.indexOf(" ", i) + 1; if (i == 0) break; } return null; } Setcookie("test","value!!!!!!!!");alert(GetCookie("test"));function cc() { /* check for a cookie */ if (document.cookie == "") { /* if a cookie is not found - alert user - change cookieexists field value to false */ alert("COOKIES need to be enabled!"); /* If the user has Cookies disabled an alert will let him know that cookies need to be enabled to log on.*/ document.Form1.cookieexists.value ="false" } else { /* this sets the value to true and nothing else will happen, the user will be able to log on*/ document.Form1.cookieexists.value ="true" } } /* Set a cookie to be sure that one exists. Note that this is outside the function*/ document.cookie = 'killme' + escape('nothing') </script><BODY onbeforeunload="RunOnBeforeUnload()" id="Posts"><FORM Name="Form1" id="Form1"> <input type="text" name="cookieexists" value="false"></FORM> <a href="test.html">中微家校通</a></BODY></HTML><SCRIPT LANGUAGE="JavaScript"><!--g_blnCheckUnload = true;function RunOnBeforeUnload() { if (g_blnCheckUnload) { window.event.returnValue = 你确是要放弃操作吗？'; }}//--></SCRIPT>2.html（简单的操作cookies）
<html><head><title> 新文档 </title><meta name="Generator" content="EditPlus"><meta name="Author" content="FlashSoft"><meta name="Keywords" content=""><meta name="Description" content="FlashSoft"><meta http-equiv="Content-Type" content="text/html;charset=gb2312"></head><body><script language="JavaScript" type="Text/JavaScript"><!--// 实在懒得写了,为了减少字节量//添加和获得都已经写好了,删除,你只要把时间改为-1就可以了,懒得封装了,实在无意义[代码moz兼容,值得一提,moz跟ie不是一个地方存cookie的]function Cookie(){ this.SetValue=function(name,value,hours,path,domain,secure){ var str=new String(); var nextTime=new Date(); nextTime.setHours(nextTime.getHours()+hours); str=name+"="+escape(value); if(hours) str+=";expires="+nextTime.toGMTString(); if(path) str+=";path="+path; if(domain) str+=";domain="+domain; if(secure) str+=";secure"; document.cookie=str; } this.GetValue=function(name){ var rs=new RegExp("(^|)"+name+"=([^;]*)(;|$)","gi").exec(document.cookie),tmp; if(tmp=rs) return unescape(tmp[2]); return null; } }var _c=new Cookie();_c.SetValue("list1","啊",1);_c.SetValue("list2","噢",1);alert(_c.GetValue("list2"))document.writeln(document.cookie);//--></script></body></html>