web worker在react项目中的使用

新建一个worker.js文件，编写worker子线程脚本，代码如下：

const workercode = () => {

  self.onmessage = function(e) {
    console.log('Message received from main script');
    var workerResult = 'Received from main: ' + (e.data);
    console.log('Posting message back to main script');
    self.postMessage(workerResult); // here it's working without self
  }
};
// 把脚本代码转为string
let code = workercode.toString();
code = code.substring(code.indexOf("{")+1, code.lastIndexOf("}"));

const blob = new Blob([code], {type: "application/javascript"});
const worker_script = URL.createObjectURL(blob);

module.exports = worker_script;

　按照上述方式，创建好worker_script，在react项目组件中引用时只需要在对应的组件文件中：

import worker_script from './worker';
var myWorker = new Worker(worker_script);

myWorker.onmessage = (m) => {
       console.log("msg from worker: ", m.data);
};
myWorker.postMessage('im from main');