js写入和读取Cookie

//写入Cookie     document.cookie = "cookieName=" + escape("要写入的内容");//cookieName为要写入的Cookie的名称     //读Cookie，返回值为相应Cookie的内容     function getCookie(cookieName){      var cookieContent = '';      var cookieAry = document.cookie.split("; ");//得到Cookie数组       for(var i=0;i<cookieAry.length;i++){          var temp = cookieAry[i].split("=");          if(temp[0] == cookieName){               cookieContent = unescape(temp[1]);          }      }      return cookieContent;  }