原生js觸碰到底部觸發函數;

  /**
  function __morebook(){
    console.log(123)
  }
  ScrollBottom(function(){__morebook();});
  **/

  //若是直接寫一個以下:
  //  ScrollBottom 方法裏有個參數x,x做爲函數帶參數。而後經過doFun去調用;
  //  爲什麼doFun作爲參數也調用了,是由於方法裏有個setTimeOut;
  //  這樣寫的意義是什麼呢?是將scrollBottom寫成公用方法,能夠經過任何方式點擊或者滾動均可以調用;
  ScrollBottom(function(){console.log('碰到底部:',123)})
  //點擊: $("jsMoreTip").click(function () { __morebook() });

      //滾動條到底部觸發的事件
  function ScrollBottom(x){
    function __getScrollTop(){
        var scrollTop = 0, bodyScrollTop = 0, documentScrollTop = 0;
        if(document.body){bodyScrollTop = document.body.scrollTop;}
        if(document.documentElement){documentScrollTop = document.documentElement.scrollTop;}
        scrollTop = (bodyScrollTop - documentScrollTop > 0) ? bodyScrollTop : documentScrollTop;
        return scrollTop;
    }
    function __getWindowHeight(){
        var windowHeight = 0;
        if(document.compatMode == "CSS1Compat"){
        windowHeight = document.documentElement.clientHeight;
        }else{
          windowHeight = document.body.clientHeight;
        }
        return windowHeight;
    }
    function __getScrollHeight(){
        var scrollHeight = 0, bodyScrollHeight = 0, documentScrollHeight = 0;
        if(document.body){bodyScrollHeight = document.body.scrollHeight;}
        if(document.documentElement){documentScrollHeight = document.documentElement.scrollHeight;}
        scrollHeight = (bodyScrollHeight - documentScrollHeight > 0) ? bodyScrollHeight : documentScrollHeight;
        return scrollHeight;
    }
    window.onscroll = function(){
        if(__getScrollTop() + __getWindowHeight() == __getScrollHeight())
        doFun(x)
    };
  }
  function doFun(x){setTimeout(x,0)}
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