vue3 引入workers 大量优化业务代码和复杂的计算的代码

前沿

vite 页面引入worker

在src 新建一个 worker.d.ts 文件

declare module '*.worker.ts' {
    class WebpackWorker extends Worker {
      constructor();
    }
    export default WebpackWorker;
  }

在 tsconfig.json 页面引入

  "lib": ["esnext", "dom", "dom.iterable", "scripthost", "WebWorker"],

最后新建 work 文件夹

export {};
const getCounter = (params: any) => {
  console.log(params);
  const start = new Date().getTime();
  console.log('开始计算斐波那契数任务');
  let count = 0;
  // 1e9
  const newArr = [];
  for (let i = 0; i < 1e9; i++) {
    count += i;
  }
  const end = new Date().getTime();
  console.log('继续主线程，耗时：', end - start);
  postMessage(count);
};
onmessage = function (event) {
  const { data } = event;
  const { type, params } = event.data;
  console.log(params);
  if (type === 'start') {
    getCounter(params);
  }
  if (data === 'stop') {
    postMessage('ended');
  }
  console.log(event.data);
};

 最后在你需要的页面引入 头部（vue3 cli ）

const worker = new Worker(new URL('@/workers/scan.worker.ts?worker', import.meta.url));

在vite 里面可以直接引入

import MyWorker from "@/utils/workers/workers.ts?worker"

下面的逻辑就是接受那边的数据

onMounted(() => {
  console.log(worker);
    worker.postMessage(
      {
        type: 'start',
        params: { name:  1 },
      });
  // set up an onmessage listener on Countdown worker object to listen to updates from the worker thread
  worker.onmessage = (e: any) => {
    console.log(e.data);
    // check if the counter value sent by the worker is divisible by 10, and if it is, call the getDogImage method again
    // if (counter.value % 10 === 0) {
    //   getDogImage();
    // }
  };
   worker.onerror = (e: any) => {
      console.log(e);
    };
});

worker.onmessage 方法就是可以接受那边的处理完的数据 当然也可以不需要接受
缺点： 不能操作dom,
优点： 性能优化大大优化