<!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>Document</title>
</head>
<body>
<ul>
控件
</ul>
<script>
setTimeout(() => {
// 插入十万条数据
const total = 100000
// 一次插入 20 条，如果觉得性能不好就减少
const once = 20
// 渲染数据总共需要几次
const loopCount = total / once
let countOfRender = 0
let ul = document.querySelector('ul')
function add() {
// 优化性能，插入不会造成回流
const fragment = document.createDocumentFragment()
for (let i = 0; i < once; i++) {
const li = document.createElement('li')
li.innerText = Math.floor(Math.random() * total)
fragment.appendChild(li)
}
ul.appendChild(fragment)
countOfRender += 1
loop()
}
function loop() {
if (countOfRender < loopCount) {
window.requestAnimationFrame(add)
}
}
loop()
}, 0)
</script>
</body>
</html>
