# js处理大数据不卡顿
# 使用webworker
html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div style="height: 300px;background: red;"></div>
<div style="height: 300px;background: blue;"></div>
<div style="height: 300px;background: yellow;"></div>
<div style="height: 300px;background: red;"></div>
<div style="height: 300px;background: blue;"></div>
<div style="height: 300px;background: yellow;"></div>
<div style="height: 300px;background: red;"></div>
<div style="height: 300px;background: blue;"></div>
<div style="height: 300px;background: yellow;"></div>
<div style="height: 300px;background: red;"></div>
<div style="height: 300px;background: blue;"></div>
<div style="height: 300px;background: yellow;"></div>
<script>
let works = new Worker('work.js') // 1.新建works
works.postMessage({max: 10000000}) // 2 给works发送参数
works.onmessage = function (event) { // 6. 接收works的数据并处理操作
console.log(event.data)
works.terminate() // 7 关闭works主线程
}
</script>
</body>
</html>
work.js
self.addEventListener('message', function (e) {
shui(e.data.max) // 3. works接收参数并处理 不会影响主线程 不会造成主页面卡顿
}, false)
function shui(numMax) {
let arr = [] // 伪造大量测试数据
function getRandom() {
let random = Math.ceil(Math.random() * 10000)
return random
}
for (let i = 0; i < numMax; i++) {
arr.push(getRandom())
}
arr.sort(function
(a, b) { return a - b } // 排序
)
postMessage(arr) // 4. works处理完数据 发送回主页面
self.close() // 5.记得要关闭哦
}