前端监控系统

最新更新时间：2019年05月08日18:03:19

《猛戳-查看我的博客地图-总有你意想不到的惊喜》

概述

资源加载出错的捕获方案

<img src="image.gif" onerror="myFunction()">

document.getElementById("myImg").addEventListener("error", myFunction);

function myFunction() {
	document.getElementById("demo").innerHTML = "无法加载图片。";
}

运行时出错的捕获方案

//方案一
try{
	let a = 0;
	console.log(a)
}cache(e){
	//错误信息发送给后端，保存到数据库
	sendMonitorErrorInfo(JSON.stringfy(e));
}
//方案二：以react项目为例，监控某个页面的异常
componentWillMount() {
    //运行时监控系统
    window.onerror = function(msg, url, row, column, error) {
      //console.log('完整信息无法发送给后端',error)
      sendMonitorErrorInfo(msg, url, row, column, error.toString()).then( res => {
        //console.log(res);
      }).catch((e) => {
        //console.log(e);
      })
    }
}
//方案三：MDN推荐的形式
componentWillMount() {
    //运行时监控系统
    window.onerror = function (msg, url, lineNo, columnNo, error) {
    	var string = msg.toLowerCase();
    	var substring = "script error";
    	if (string.indexOf(substring) > -1){
        	alert('Script Error: See Browser Console for Detail');
    	} else {
        	var message = [
            	'Message: ' + msg,
            	'URL: ' + url,
            	'Line: ' + lineNo,
            	'Column: ' + columnNo,
            	'Error object: ' + JSON.stringify(error)
        	].join(' - ');
        	alert(message);
    	}
    	return false;
	};
}

window.onerror做全局监控的跨域问题

假设在www.wanshaob.com/static/a.js中做全局监控，不同域的www.hehe.com/static/b.js上报错误信息给主域名www.wanshaob.com，此时会被拦截

//通过onerror函数收集不同域的js文件的错误，需要做两个处理：
//1、设置存放js文件的服务器允许跨域，/usr/local/webserver/nginx/conf/nginx.conf的配置文件中配置以下参数：
http {
    server {
        location / {
			add_header Access-Control-Allow-Origin *;
    		add_header Access-Control-Allow-Methods 'GET, POST, OPTIONS';
    		add_header Access-Control-Allow-Headers 'DNT,X-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization';
        }
    }
}
//配置文件nginx.conf的完整信息
http {
    include             mime.types;
    default_type        application/octet-stream;
    server {
        listen       80;
        server_name  wanshaobo.cn;
        access_log   logs/1.log  combined;
        error_log    logs/2.log   warn;

        location / {
            root /root/html/dist;
            index index.html;
            try_files $uri /index.html;

			add_header Access-Control-Allow-Origin *;
    		add_header Access-Control-Allow-Methods 'GET, POST, OPTIONS';
    		add_header Access-Control-Allow-Headers 'DNT,X-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization';

    		if ($request_method = 'OPTIONS') {
        		return 204;
    		}
        }

        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_pass http://127.0.0.1:8001/;
        error_page   500 502 503 504  /50.html;
    }

}
//2、引用相关的js文件时加上crossorigin属性
<script type="text/javascript" src="http://www.hehe.com/static/b.js"  crossorigin></script>

参考资料

• Global​Event​Handlers​.onerror
  

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