cookie的使用

 //存储cookie
 function setCookie(name,value,end_day){
  var date = new Date();
  date.setDate(date.getDate() + end_day);
  document.cookie = name + '=' + escape(value) + (end_day?';expires='+date.toString():'');
 }
 //获取cookie
 function getCookie(name){
  if(document.cookie){
   var coo = document.cookie;
   var arr1 = coo.split('; ')
   var arr2 = [];
   for(var i = 0;i < arr1.length;i++){
    arr2.push(arr1[i].split('='));
   }
   if(name){
    for(var j = 0;j < arr2.length;j++){
     if(arr2[j][0]==name){
      return unescape(arr2[j][1]);
     }
    }
   }else{
    var obj = {};
    for(var j = 0;j < arr2.length;j++){
     obj[arr2[j][0]] = unescape(arr2[j][1]);
    }
    return obj;
   }
   
  }else{
   return false;
  }
 }

 //删除cookie
 function clearCookie(name){
  setCookie(name,'',-1);
 }