监听是否到达页面滑动的可视区域最底部

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;
            }
            //文档的总高度
            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;
            }
            //浏览器视口的高度
            function getWindowHeight(){
                var windowHeight = 0;
            　　if(document.compatMode == "CSS1Compat"){
            　　　　windowHeight = document.documentElement.clientHeight;
            　　}else{
            　　　　windowHeight = document.body.clientHeight;
            　　}
            　　return windowHeight;
            }
            //监听滚动条的事件内容
            window.onscroll = function(){
            　　if(getScrollTop() + getWindowHeight() == getScrollHeight()){
                    console.log("getScrollTop:"+getScrollTop()+"**getWindowHeight:"+getWindowHeight()+"**getScrollHeight:"+getScrollHeight())
            　　}
            };

 原链接地址：https://blog.csdn.net/qq_29301417/article/details/78684495