<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>test</title>
</head>
<body>
<div id="box"></div>
<script type="text/javascript">
function addData() {
let box = document.getElementById('box');
for (let i = 0; i < 50; i++) {
let span = document.createElement('span');
span.innerHTML = 'test' + i + '<br>';
box.appendChild(span);
}
}
addData();
window.onscroll = function () {
//scrollTop就是触发滚轮事件时滚轮的高度
var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
console.log("滚动距离" + scrollTop);
//变量windowHeight是可视区的高度
var windowHeight = document.documentElement.clientHeight || document.body.clientHeight;
console.log("可视高度" + windowHeight);
//变量scrollHeight是滚动条的总高度
var scrollHeight = document.documentElement.scrollHeight || document.body.scrollHeight;
console.log("总高度" + scrollHeight);
//判断滚动条是否到底部
if (scrollTop + windowHeight == scrollHeight) {
//加载数据
console.log("距顶部" + scrollTop + "可视区高度" + windowHeight + "滚动条总高度" + scrollHeight);
addData();
}
}
</script>
</body>
</html>