目录
安装 loader
应用场景
打包时错误处理
安装 loader
npm install worker-loader -D如果直接把worker.js放到public目录下，则不需要安装loader
vue.config.js
const { defineConfig } = require('@vue/cli-service')
module.exports = defineConfig({
transpileDependencies: true,
lintOnSave:false, // 关闭eslint检查
parallel: false ,
chainWebpack: config => {
config.module
.rule('worker')
.test(/\.worker\.js$/) // 文件名必须要xxx.worker.js
.use('worker')
.loader('worker-loader')
}
})index.vue
<template>
<div class="HoneViewPage">
<div class="HoneViewPageOutbox">
<el-button @click="useWorker">calculate</el-button>
<div>
{{ result }}
</div>
</div>
</div>
</template>
<script>
import Worker from './demo.worker.js'; // this.worker = new Worker(); 方式才需要引入
export default {
name: 'HoneViewPage',
data() {
return {
result: 0,
worker: null
}
},
mounted() {
this.InitFun()
},
methods: {
InitFun() {
/*
**1.this.worker = new Worker() 这种方式使用，需要这样引入 import Worker from './demo.worker.js';
**使用上面import进来的js，名字为 demo.worker.js，不可配置，路径相对比较灵活，需要worker-loader npm install worker-loader -D
**2.this.worker = new Worker('worker.js', { name : 'myWorker' });读取public目录下得js文件，可以配置名字，简单粗暴，不需要worker-loader
**worker的名字，主要在谷歌浏览器 - 控制台 - sources 中体现
*/
//
this.worker = new Worker();
this.worker.onmessage = event => {
this.result = event.data;
console.log('主线程收到回复，即将关闭worker连接');
// this.worker.terminate();
}
},
useWorker() {
const path = [
[108.566, 40.688],
[107.53, 40.551],
];
this.worker.postMessage(path)
}
},
beforeDestroy() {
this?.worker?.terminate()
},
}
</script>
<style scoped lang="scss">
.HoneViewPage {
display: flex;
flex-flow: row nowrap;
justify-content: center;
align-items: center;
width: 100%;
height: 100%;
// background: #dde3e3;
.HoneViewPageOutbox {
display: flex;
flex-flow: column;
justify-content: center;
align-items: center;
width: calc(100% - 30px);
height: calc(100% - 30px);
background: #dde3e3;
}
}
</style>demo.worker.js
import * as THREE from 'three';
onmessage = (e) => {
console.log(e.data);
console.log(`THREE`, THREE);
const posArry = e.data; // e.data用于存储移动路线的数组
const path = new THREE.LineCurve(posArry[0], posArry[1]);
console.log(`path`, path);
postMessage(path);
}应用场景
浏览器的JS线程和GUI渲染线程互斥
在主线程跑吃性能的同步任务，GUI渲染线程会挂起，页面不能及时响应渲染
在worker跑时，GUI渲染线程不会被挂起，页面可以正常响应
优势：
避免页面渲染阻塞。用一个worker处理主线程的任务，两者处理时间差不多，worker的优势在于处理过程中不会影响页面的渲染（e.g. 导出时 Element.message组件弹出提示，但是由于JS处理时间过长，导致页面渲染被阻塞，提示不能及时显示）
减少任务处理时间。worker可以有多个（多线程），用多个worker处理主线程的任务时，总的任务时长会减少（e.g. 压缩100张图片）
打包时错误处理
ERROR Failed to compile with 1 error 16:12:04
error in ./src/pages/HoneViewPage/demo.worker.js
Syntax Error: Thread Loader (Worker 0)
Cannot read properties of undefined (reading 'options')
ERROR Error: Build failed with errors.
Error: Build failed with errors.
at D:\test_project\vue_worker-loader\node_modules\@vue\cli-service\lib\commands\build\index.js:207:23
at D:\test_project\vue_worker-loader\node_modules\webpack\lib\webpack.js:148:8
at D:\test_project\vue_worker-loader\node_modules\webpack\lib\HookWebpackError.js:68:3
at Hook.eval [as callAsync] (eval at create (D:\test_project\vue_worker-loader\node_modules\tapable\lib\HookCodeFactory.js:33:10), <anonymous>:6:1)
at Hook.CALL_ASYNC_DELEGATE [as _callAsync] (D:\test_project\vue_worker-loader\node_modules\tapable\lib\Hook.js:18:14)
at Cache.shutdown (D:\test_project\vue_worker-loader\node_modules\webpack\lib\Cache.js:150:23)
at D:\test_project\vue_worker-loader\node_modules\webpack\lib\Compiler.js:1225:15
at Hook.eval [as callAsync] (eval at create (D:\test_project\vue_worker-loader\node_modules\tapable\lib\HookCodeFactory.js:33:10), <anonymous>:6:1)
at Hook.CALL_ASYNC_DELEGATE [as _callAsync] (D:\test_project\vue_worker-loader\node_modules\tapable\lib\Hook.js:18:14)
at Compiler.close (D:\test_project\vue_worker-loader\node_modules\webpack\lib\Compiler.js:1218:23)Syntax Error: Thread Loader(Worker 1)
Cannot read properties of undefined (reading 'options')
框架：@vue/cli@5 + vue@2.7 + ts
vue-cli 使用wokrer-loader 加载web woker时，使用npm run build 有很大机率会打包失败，报错如上。
thread-loader 与worker-loader有冲突。
解决：
vue.config.js 配置
parallel: false
构建正式环境关闭thread-loader
parallel: false vue.config.js
const { defineConfig } = require('@vue/cli-service')
module.exports = defineConfig({
transpileDependencies: true,
lintOnSave:false, // 关闭eslint检查
parallel: false ,
chainWebpack: config => {
config.module
.rule('worker')
.test(/\.worker\.js$/) // 文件名必须要xxx.worker.js
.use('worker')
.loader('worker-loader')
}
})vue-cli: Syntax Error: Thread Loader:https://blog.csdn.net/qq_35459724/article/details/127080017
配置参考 | Vue CLI (vuejs.org);https://cli.vuejs.org/zh/config/#devserver-proxy
参考链接：https://blog.csdn.net/weixin_44240581/article/details/129186915
预览：https://1t1824d.github.io/vue-worker_loader_preview/#/
