touchStart(e) {
   // Don't react if initial down happens on a form element
   //注释掉这段代码就行
   // if (e.target.tagName.match(/input|textarea|select/i)) {
   //  return
   // }
   //注释掉这段代码就行
   if (e.target.tagName.match(/textarea|select/i)) {
    return;
   }
   this.scroller.doTouchStart(e.touches, e.timeStamp);
  },
   touchMove(e) {
   //touchMove也要重新加个判断，否则input框不能左右滑动
   if (!e.target.tagName.match(/input/i)) {
    e.preventDefault();
   }
   this.scroller.doTouchMove(e.touches, e.timeStamp);
  },

  mouseDown(e) {
   // Don't react if initial down happens on a form element
   //注释掉这段代码就行
   // if (e.target.tagName.match(/input|textarea|select/i)) {
   //  return
   // }
   //注释掉这段代码就行
   if (e.target.tagName.match(/textarea|select/i)) {
    return;
   }
   this.scroller.doTouchStart(
    [
     {
      pageX: e.pageX,
      pageY: e.pageY
     }
    ],
    e.timeStamp
   );
   this.mousedown = true;
  },