var width = $(window).width();          var height = $(window).height();          var html = "
     
      ";          html += "
      
       ";          html += "正在加载，请等待...";          html += "
      
";          html += "
     
";          window.onload = function () {              var mask = document.getElementById('loading');              mask.parentNode.removeChild(mask);          };          document.write(html);

加上这段代码就好了！