javascript应用cookie封装代码

<script>
var cookie=new function(){ 
  this.set=function(name,value,hours){ 
    var life=new Date().getTime(); 
    life+=hours*1000*60; 
    var cookieStr=name+"="+escape(value)+";expires="+new Date(life).toGMTString(); 
    document.cookie=cookieStr; 
  } 
  this.get=function(name){ 
    var cookies=document.cookie.split(";"); 
    if(cookies.length>0){ 
      var cookie=cookies[0].split("="); 
      if(cookie[0]==name){
        return unescape(cookie[1])
      } 
    } 
    return null; 
  }
  this.remove=function(name){ 
    var cookieStr=name+"="+escape('null')+";expires="+new Date().toGMTString(); 
    document.cookie=cookieStr; 
  }
}
</script>