使用自己定义的DIV的滚动条

基本思路：

 让DIV浮动起来，利用postion:fixed/absolute,设定height:100%  

  var $card=$("#cardDetail");
      $card.css({"width":"90%"});
      var wl=($(window).width()-$card.width())/2;
      var leftstr=wl+"px";
      var topstr=this.$root.$data.header_h+"px";
      $card.css({"position":"absolute","top":topstr,"height":"100%","overflow":"auto"});