浏览器滚动条到底部自动加载更多

代码如下

$(window).on('scroll',function(){
/console.log("scrollTop--->" + scrollTop());
console.log("windowHeight--->" + windowHeight());
console.log("documentHeight--->" + documentHeight());/
if(scrollTop() + windowHeight() >= documentHeight()){
loadMore();
}
});
function loadMore() {
console.log("enter load More , isloading = " + isloading);

}
function scrollTop(){
return Math.max(
//chrome
document.body.scrollTop,
//firefox/IE
document.documentElement.scrollTop);
}
function documentHeight(){
//现代浏览器（IE9+和其他浏览器）和IE8的document.body.scrollHeight和document.documentElement.scrollHeight都可以
return Math.max(document.body.scrollHeight,document.documentElement.scrollHeight);
}
function windowHeight(){
return (document.compatMode == "CSS1Compat")?
document.documentElement.clientHeight:
document.body.clientHeight;
}