//   写入
  $.cookie('the_cookie','the_value');
//  读取
  $.cookie('the_cookie');
//  删除
  $.cookie('the_cookie',null)
例子

<script src="js/jquery.cookie.js"></script>

</script>
<script>
 $(function(){
  var COOKIE_NAME='username';
  if($.cookie(COOKIE_NAME)){
   $("#username").val($.cookie(COOKIE_NAME));
  }
  $("#check").click(function(){
   if(this.checked){
    $.cookie(COOKIE_NAME,$("#username").val(),{path:'/',expires:10});
   }else{
    $.cookie(COOKIE_NAME,null,{path:'/'});
   }
  })
 })
</script>