从崩溃到优化：Flash应用中的Page Crash监控实战指南

页面崩溃

页面无法到达unload阶段

• 使用Web Worker检测和报告页面崩溃
• 实现心跳机制监控页面响应状态
• 将崩溃信息上报至配置的后端服务

WorkerCode

接受来自主线程的消息

onmessage=(event)=>{let{ 
			type,pageTime: receivedPageTime, 
			pageUrl, 
			url, 
			id, 
			eventData, 
			state 
		}= event.data;if(url){
	  fetchUrl = url;// 接收主线程传递的配置}if(id){
	  userId = id;// 接收主线程传递的配置}
	nowUrl = pageUrl;
	crashState = state;
	crashEventData = eventData;if(type ==='heartbeat-response'){
	  pageTime = receivedPageTime;}elseif(type ==='page-unload'){isCrash();const nowTime = performance.now();if(nowTime - pageTime >= setTimeoutTime *2&&!crash){reportError();}clearInterval(intervalId);close();}};
intervalId =setInterval(()=>{isCrash();sendHeartbeat();}, setTimeoutTime);

主线程

functioncrashLoop():void{const workerBlob =newBlob([workerCode],{type:'application/javascript'})const workerUrl =URL.createObjectURL(workerBlob)const worker =newWorker(workerUrl)
    
    worker.postMessage({id: userId, url })
    worker.onmessage=(event: MessageEvent)=>{const{ type }= event.data
      if(type ==='heartbeat'){const eventData =getRecordScreenData()const behavior =getBehaviour()const state = behavior?.breadcrumbs?.state ||[]
        worker.postMessage({type:'heartbeat-response',pageTime: performance.now(),pageUrl: window.location.href,
          eventData,
          state
        })}}// 页面卸载时通知Worker
    window.addEventListener('beforeunload',()=>{
      worker.postMessage({type:'page-unload'})})}