Javascript ScrollUp Effect

jsScrollupEffect.js

function scrollUp(nowHeight,scrollHeight) {
  //window scroll animation
  function moveScroller(){
    function outPut(arg){
         window.scrollTo(0,arg);
      }
      for(var i = nowHeight; i <= scrollHeight; i++){
          setTimeout((function(pos){
              return function(){ outPut(pos); }
          })(i), i * 2);
        //})(-i), i * 2);
        //the number 2 can be edited,it effects the speed of scrolling
        //数字2可以修改，这会影响到你的滚动时候的速度
    //the words aboves means you can edit the code and make the direction oppositly
    //上面的语句修改，可以让你的滚动方向相反，具体需要你在项目实际过程中的需求
      }
  }
  function _move(){
         return function(){
               moveScroller();
               fadeEffect.init(spID,1);
         }
  }
  window.setTimeout(_move(),500);
}