ブラウザスクロールロード判定条件

window.onscroll = function (e) {
    /*           */
    /*                  */
    var e =e || window.event;
    //           document.body.scrollTop     
    /*          */
    var scrolltop = document.documentElement.scrollTop||document.body.scrollTop;
    /*           */
    var scrollHeight = document.documentElement.scrollHeight||document.body.scrollHeight;
    /*        */
    var clientHeight = document.documentElement.clientHeight||document.body.clientHeight;

    /*  scrolltop clientHeight   scrollHeight */
    if(scrollHeight === (scrolltop+clientHeight)){
      console.log('         ');
    }
  }