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：

/***
*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);
 }
};

更多关于javascript相关内容感兴趣的读者可查看本站专题：《javascript数据结构与算法技巧总结》、《javascript遍历算法与技巧总结》、《javascript查找算法技巧总结》、《javascript动画特效与技巧汇总》、《javascript错误与调试技巧总结》及《javascript数学运算用法总结》

希望本文所述对大家javascript程序设计有所帮助。