jquery에서 위아래 스크롤 이벤트를 비활성화하는 방법

$(document).bind('mousewheel', function(event, delta) {return false;});

$(document).unbind('mousewheel');

window.onscroll = function(){
  p=$(this).scrollTop();
  if(t>p){
    console.log("向上滚动");
  }
  t = p;
};

// 获取浏览器窗口的可视区域的高度
function getViewPortHeight() {
  return document.documentElement.clientHeight || document.body.clientHeight;
}
window.onscroll = function(){
  p=$(this).scrollTop();
  let height = getViewPortHeight();
  if (p >= height){
    $(document).unbind('mousewheel');
  }
  if(t>p){
    if (p < height) {
        $(document).bind('mousewheel', function(event, delta) {
          return false;
        });
        $('html,body').animate({scrollTop:0},1000);
      }
    }
  }
  t = p;
};

$._data(obj[0],"event")
var objEvt = $._data($(document)[0], 'events');
window.onscroll = function(){
  p=$(this).scrollTop();
  let height = getViewPortHeight();
  if (p >= height){
    $(document).unbind('mousewheel');
    objEvt = $._data($(document)[0], 'events');
  }
  if(t>p){
    if (p < height) {
      if (!objEvt){
        $(document).bind('mousewheel', function(event, delta) {
          return false;
        });
        objEvt = $._data($(document)[0], 'events');
        $('html,body').animate({scrollTop:0},1000);
      }
    }
  }
  t = p;
};