移动设备上的滚动位置更新

Question

我使用下面的代码，工作得很好。然而，当我在手机上查看它时，触发器不会运行直到滚动停止，而不是在到达该点时。滚动移动设备时有没有办法报告滚动位置？而不是什么时候停止。

var waypoint = new Waypoint({
 element: document.getElementById('trigger-1'),
  handler: function(direction) {
   console.log(direction);
   if(direction == "down"){
    $(".sign-up-absolute").css("position","fixed");
    $(".sign-up-absolute").css("top","25%");
   }
    else{
    $(".sign-up-absolute").css("position","absolute");
    $(".sign-up-absolute").css("top","150px");
   }
  }
 });

 var waypoint = new Waypoint({
  element: document.getElementById('trigger-2'),
    handler: function(direction) {
      if(direction == "up"){
        $(".sign-up-absolute").css("position","fixed");
        $(".sign-up-absolute").css("top","25%");
       }
       else{
        $(".sign-up-absolute").css("position","absolute");
        $(".sign-up-absolute").css("top","150px");
        }
      }   
  });