JS实现Cookie读、写、删除操作工具类示例

/****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();  }}

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); }};