【JavaScript代码实现四】获取和设置 cookie

 1 // 创建cookie
 2 function setCookie(name, value, expires, path, domain, secure) {
 3     var cookieText = encodeURIComponent(name) + '=' +encodeURIComponent(value);
 4     if (expires instanceof Date) {
 5         cookieText += '; expires=' + expires;        
 6     }
 7     if (path) {
 8         cookieText += '; expires=' + expires;        
 9     }
10     if (domain) {
11         cookieText += '; domain=' + domain;        
12     }
13     if (secure) {
14         cookieText += '; secure';                
15     }
16     document.cookie = cookieText;
17 }
18 // 获取cookie
19 function getCookie(name) {
20     var cookieName = encodeURIComponent(name) + '=';
21     var cookieStart = document.cookie.indexOf(cookieName);
22     var cookieValue = null;
23     if (cookieStart > -1) {
24         var cookieEnd = document.cookie.indexOf(';', cookieStart);
25         if (cookieEnd == -1) {
26             cookieEnd = document.cookie.length;
27         }
28         cookieValue = decodeURIComponent(document.cookie.substring(cookieStart + cookieName.length, cookieEnd));
29     }
30     return cookieValue;
31 }
32 // 删除cookie
33 function unsetCookie(name) {
34     document.cookie = name + "= ; expires=" + new Date(0);  
35 }