原生js触碰到底部触发函数;

标签: 前端

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

  //如果直接写一个如下:
  //  ScrollBottom 方法里有个参数x,x作为函数带参数。然后通过doFun去调用;
  //  为何doFun做为参数也调用了,是因为方法里有个setTimeOut;
  //  这样写的意义是什么呢?是将scrollBottom写成公用方法,可以通过任何方式点击或者滚动都可以调用;
  ScrollBottom(function(){console.log('碰到底部:',123)})
  //点击: $("jsMoreTip").click(function () { __morebook() });

      //滚动条到底部触发的事件
  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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本文链接:https://blog.csdn.net/xiaozhen0610/article/details/107688029