1 //cookie部分
2 //设置cookie
3 //注意cname传入字符串类型，如：setCookie('first');
4 function setCookie(cname,cvalue,exdays){
5 var d = new Date();
6 d.setTime(d.getTime()+(exdays*24*60*60*1000));
7 var expires = "expires="+d.toGMTString();
8 document.cookie = cname+"="+cvalue+"; "+expires;
9 }
10 //获取cookie
11 function getCookie(cname){
12 var name = cname + "=";
13 var ca = document.cookie.split(';');
14 for(var i=0; i<ca.length; i++) {
15 var c = ca[i].trim();
16 if (c.indexOf(name)==0) return c.substring(name.length,c.length);
17 }
18 return "";
19 }
20 //检查cookie
21 function checkCookie(){
22 var user=getCookie("username");
23 if (user!=""){
24 alert("Welcome again " + user);
25 }
26 else {
27 user = prompt("Please enter your name:","");
28 if (user!="" && user!=null){
29 setCookie("username",user,30);
30 }
31 }
32 }
33 //删除单个cookie
34 function clearCookie(name) {
35 setCookie(name, "", -1);
36 }
37 //删除所有cookie
38 function clearAllCookie(){
39 var keys=document.cookie.match(/[^ =;]+(?=\=)/g);
40 if (keys) {
41 for (var i = keys.length; i--;)
42 document.cookie=keys[i]+'=0;expires=' + new Date( 0).toUTCString()
43 }
44 }
