原生js操作cookie

    //设置cookie
    function setCookie(name,value,time){
        var exdate=new Date();
        exdate.setTime(exdate.getTime()+time * 1000);
        document.cookie=name+"="+escape(value)+((time==null)? "":";expires="+exdate.toGMTString())
    }
    
    //获取cookie
  function getCookie(name){
    if(document.cookie.length>0){
      var c_start=document.cookie.indexOf(name + "=");
      if(c_start!=-1){
        c_start=c_start+name.length+1;
        c_end=document.cookie.indexOf(";",c_start);
        if(c_end==-1){
          c_end=document.cookie.length;
        }
        return unescape(document.cookie.substring(c_start,c_end));
      }
    }
    return "";
  }
  
  //删除cookie
  function removeCookie(name){
      var value = getCookie(name);
      if(value == ""){
          return;
      }
      //获取当前时间
      var exdate=new Date();
      //设置过期时间为过去的时间
      exdate.setTime(exdate.getTime()-1000);
      document.cookie = name+"="+escape(value)+";expires="+exdate.toGMTString()
  }