表单长时间无响应，页面失效提示

先贴代码，有时间在解释

<template>   <div :class="$style.root">     <div>主页面</div>     <el-input v-model="txt" @input="onChange" />   </div> </template> <script> const TIME = 10; //时间，用于限定多长时间无操作提醒 export default {   data() {     return {       txt: 1,       worker: null,     };   },   mounted() {     this.worker = new Worker('/worker.js');      this.worker.postMessage('start');     this.worker.addEventListener('message', e => {       console.log('e: ', e.data);       const { times } = e.data;       if (times >= TIME) {         this.$message.error('页面失效');         // 结束通信         this.worker.postMessage('end');       }     });     document.addEventListener('visibilitychange', function () {       if (document.visibilityState == 'visible') {         console.log('页面已显示');       } else if (document.visibilityState == 'hidden') {         console.log('页面已隐藏');       }     });   },   methods: {     onChange() {       this.worker.postMessage('end');       this.worker.postMessage('start');     },   }, }; </script> <style lang="scss" module> @import '../../styles/common';  .root {   @include center; } </style> 

// public下面的worker.js

let timer; self.addEventListener('message', e => {   let times = 0;   let msg;   if (e.data == 'start') {     timer = setInterval(() => {       times++;       msg = {         status: 'editing',         times,       };       self.postMessage(msg);     }, 1 * 1000);   } else {     times=0;     clearInterval(timer);   } });