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);}
});