jq 回到顶部

头部要引入jquery文件

<a href="javascript:scroll(0,0)" id="go" style="position: fixed; bottom: 75px; right: 75px;">返回顶部</a><script>  $(function() {    var s = document.body.clientHeight;    $(window).scroll(function() {      var p = document.body.scrollTop;      if(p > 1000 ){        $('#go').css("display","block");      }else{        $('#go').css("display","none");      }    });  }  )</script>