标签：value 更新 ast javascrip string var ref 分析 page
1 var CookieUtil = { 2 get: function(name) { 3 var cookieName = encodeURIComponent(name) + "=", 4 cookieStart = document.cookie.indexOf(cookieName), 5 cookieValue = null; 6 if(cookieStart > -1) { 7 var cookieEnd = document.cookie.indexOf(";", cookieStart); 8 if(cookieEnd == -1) { 9 cookieEnd = document.cookie.length; 10 } 11 cookieValue = decodeURIComponent(document.getCookie.substring(cookieStart + cookieName.length, cookieEnd)); 12 } 13 return cookieValue; 14 }, 15 set: function(name, value, expires, path, domain, secure) { 16 var cookieText = encodeURIComponent(name) + "=" + 17 encodeURIComponent(value); 18 if(expires instanceof Date) { 19 cookieText += "; expires=" + expires.toGMTString(); 20 } 21 if(path) { 22 cookieText += "; path=" + path; 23 } 24 if(domain) { 25 cookieText += "; domain=" + domain; 26 } 27 if(secure) { 28 cookieText += "; secure"; 29 } 30 document.cookie = cookieText; 31 }, 32 unset: function(name, path, domain, secure) { 33 this.set(name, "", new Date(0), path, domain, secure); 34 } 35 };
//设置一个 cookie
CookieUtil.set("name", "wolfSoul");
//读取 cookie 的值
alert(CookieUtil.get("name")); // "wolfSoul"
//删除 cookie
CookieUtil.unset("name");
当超过单个域名限制之后还要再设置 cookie,浏览器就会清除以前设置的 cookie。IE 和 Opera 会删 除最近最少使用过的(LRU,Least Recently Used)cookie,腾出空间给新设置的 cookie。Firefox 看上去 好像是随机决定要清除哪个 cookie,所以考虑 cookie 限制非常重要,以免出现不可预期的后果。
标签：value 更新 ast javascrip string var ref 分析 page
原文地址：http://www.cnblogs.com/yuqing6/p/6058726.html
