text: <!DOCTYPE html>
  <html lang="en">
  <head>
      <meta charset="UTF-8">
      <title>智能社——http://www.zhinengshe.com</title>
      <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
      <meta name="apple-mobile-web-app-capable" content="yes">
      <meta name="apple-mobile-web-app-status-bar-style" content="black">
      <script src="zepto.min.js"></script>
      <script src="zepto-scrolltop.js"></script>
      <style>
          .btn1{
              position: fixed;
              right:20px;
              bottom:20px;
              padding: 20px;
          }
      </style>
      <script>
          $(function(){
              $('#btn1').on('tap',function(){
                 $.scrollTop({duration:1000, target:100});
              });
              $('#btn2').on('tap',function(){
                  $.scrollTop();
              });
          });
      </script>
  </head>
  <body style="height:3000px;">
  <p>welcome to</p>
  <p style="margin-top:100px">welcome to 100</p>
  
  <input class="btn1" type="button" value="回到顶部100" id="btn1">
  <input class="btn1" type="button" value="回到顶部0" id="btn2" style="right:140px">
  </body>
  </html>
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  