先设置一个div  高度不能设置100% 。

window.addEventListener("load",function(){

  var addEventListener = 'addEventListener';

  var elems = document.getElementsByClassName('dragscroll');

  for(var i = 0;i<elems.lenth;){

    (function(elem,lastClientX,lastClientY,pushed){

      elem.addEventListner('mousedown',function(e){

        pushed=1;
        lastClientX = e.eclientX;

        lastClientY = e.clientY;
        
        e.preventDefault();
        e,stopPropagation();
    },0)
    elemetn.addEventListener('mousemove',function(e){

      if(pushed&&pushed==1){
         elem.scrollLeft -=(- lastClientX +(lastClientX=e.clientX));

         elem.scrollTop -=(-lastClientY+(lastClientY=e.clientY)); 

      }
    },0)
    elem.addEventListener('mouseup',function(){

      pushed=0;
    },0)
  })(elemes[i++]);
  }

},0) 

 

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