jQuery 改变cursor 鼠标手势

以下纯属。。。。

<style type="text/css">
  .cursor_pointer {
    cursor:pointer;
  }
</style>


<script type="text/javascript">                                        
  $(function() {
    $('img').click(
                function() {
                    alert("Hello world!");
                  }
                )
                .hover(
                  function(){
                    $(this).addClass("cursor_pointer");
                  },
                  function(){
                    $(this).removeClass("cursor_pointer");
                  }
                );
  }
</script>