js页面滑到底部触发事件

本节目标：理解“js页面滑到底部触发事件”的核心思路，并能把它用于实际开发或面试表达。

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;
}
window.onscroll = function(){
if(getScrollTop() + getWindowHeight() == getScrollHeight()){
moreReconmend();
//	console.log("getScrollTop:"+getScrollTop()+"**getWindowHeight:"+getWindowHeight()+"**getScrollHeight:"+getScrollHeight())
}
};

> 来自

 <https://blog.csdn.net/qq_29301417/article/details/78684495>