JS实现Cookie读、写、删除操作工具类示例

本文实例讲述了JS实现Cookie读、写、删除操作工具类。分享给大家供大家参考，具体如下：/

本文实例讲述了JS实现Cookie读、写、删除操作工具类。分享给大家供大家参考，具体如下：

/***
*读取指定的Cookie值 readCookie("id");
*@param {string} cookieName Cookie名称
*/
function readCookie(cookieName) {
 var theCookie = "" + document.cookie;
 var ind = theCookie.indexOf(cookieName);
 if(ind==-1 || cookieName=="") return "";
 var ind1 = theCookie.indexOf(';',ind);
 if(ind1==-1) ind1 = theCookie.length;
 /*读取Cookie值*/
 return unescape(theCookie.substring(ind+cookieName.length+1,ind1));
}
/***
* 设置Cookie值 setCookie("id",1);
* @param {string} cookieName Cookie名称
* @param {string} cookieValue Cookie值
* @param {number} nDays Cookie过期天数
*/
function setCookie(cookieName, cookieValue) {
 /*当前日期*/
 var today = new Date();
 /*Cookie过期时间*/
 var expire = new Date();
 /*如果未设置nDays参数或者nDays为0，取默认值1*/
 //if(nDays == null || nDays == 0) nDays = 1;
 /*计算Cookie过期时间【 3600000 * 24 为一天】*/
 expire.setTime(today.getTime() + 400000); //5分钟
 document.cookie = cookieName + "=" + escape(cookieValue) + ";expires=" + expire.toGMTString();
}
/***
* 删除cookie中指定变量函数
* @param {string} $name Cookie名称
*/
function deleteCookie($name){
 var myDate=new Date();
 myDate.setTime(-1000);//设置时间
 document.cookie=$name+"=''; expires="+myDate.toGMTString();
}
/***
* 删除cookie中所有定变量函数
* @param {string} cookieName Cookie名称
* @param {string} cookieValue Cookie值
* @param {number} nDays Cookie过期天数
*/
function clearCookie(){
 var myDate=new Date();
 myDate.setTime(-1000);//设置时间
 var data=document.cookie;
 var dataArray=data.split("; ");
 for(var i=0;i<dataArray.length;i++){
 var varName=dataArray[i].split("=");
 document.cookie=varName[0]+"=''; expires="+myDate.toGMTString();
 }
}

附：JS操作cookie的小插件

var CookieUtil = {
 // 设置cookie
 set : function (name, value, expires, domain, path, secure) {
 var cookieText = "";
 cookieText += encodeURIComponent(name) + "=" + encodeURIComponent(value);
 if (expires instanceof Date) {
 cookieText += "; expires=" + expires.toGMTString();
 }
 if (path) {
 cookieText += "; path=" + path;
 }
 if (domain) {
 cookieText += "; domain=" + domain;
 }
 if (secure) {
 cookieText += "; secure";
 }
 document.cookie = cookieText;
 },
 // name=value; expires=expiration_time; path=domain_path; domain=domain_name; secure
 // 获取cookie
 get : function (name) {
 var cookieName = encodeURIComponent(name) + "=",
 cookieStart = document.cookie.indexOf(cookieName),
 cookieValue = "";
 if (cookieStart > -1) {
 var cookieEnd = document.cookie.indexOf (";", cookieStart);
 if (cookieEnd == -1) {
 cookieEnd = document.cookie.length;
 }
 cookieValue = decodeURIComponent(document.cookie.substring(cookieStart + cookieName.length, cookieEnd));
 }
 return cookieValue;
 },
 // 删除cookie
 unset : function (name, domain, path, secure) {
 this.set(name, "", Date(0), domain, path, secure);
 }
};