Node.js：任何錯誤崩潰Heroku服務器

Question

我有一個Node.js應用程序來做一些簡單的處理，但是，每次出現錯誤時，服務器崩潰。

2011-12-19T19:27:49+00:00 app[web.1]: node.js:134 
2011-12-19T19:27:49+00:00 app[web.1]:   throw e; // process.nextTick error, or 'error' event on first tick 
2011-12-19T19:27:49+00:00 app[web.1]:  ^
2011-12-19T19:27:49+00:00 app[web.1]: TypeError: Object { customer_id: 4eef8ddb74019b9d4f00001d, 
2011-12-19T19:27:49+00:00 app[web.1]: date: Mon, 19 Dec 2011 19:27:36 GMT, 
2011-12-19T19:27:49+00:00 app[web.1]: callsid: '123', 
2011-12-19T19:27:49+00:00 app[web.1]: _id: 4eef902887e9770100000008 } has no method 'save' 
2011-12-19T19:27:49+00:00 app[web.1]:  at Promise.<anonymous> (/app/src/call.js:137:24) 
2011-12-19T19:27:49+00:00 app[web.1]:  at Promise.<anonymous> (/app/node_modules/mongoose/lib/promise.js:120:8) 
2011-12-19T19:27:49+00:00 app[web.1]:  at Promise.<anonymous> (events.js:64:17) 
2011-12-19T19:27:49+00:00 app[web.1]:  at Promise.emit (/app/node_modules/mongoose/lib/promise.js:59:38) 
2011-12-19T19:27:49+00:00 app[web.1]:  at Promise.complete (/app/node_modules/mongoose/lib/promise.js:70:20) 
2011-12-19T19:27:49+00:00 app[web.1]:  at /app/node_modules/mongoose/lib/query.js:738:28 
2011-12-19T19:27:49+00:00 app[web.1]:  at model.init (/app/node_modules/mongoose/lib/model.js:181:36) 
2011-12-19T19:27:49+00:00 app[web.1]:  at cb (/app/node_modules/mongoose/lib/query.js:736:14) 
2011-12-19T19:27:49+00:00 app[web.1]:  at Array.<anonymous> (/app/node_modules/mongoose/lib/utils.js:394:16) 
2011-12-19T19:27:49+00:00 app[web.1]:  at model.<anonymous> (/app/node_modules/mongoose/lib/document.js:181:5) 

如何防止出現此類錯誤？例如，當我調用一個不存在的變量時，服務器崩潰。我瞭解錯誤，但有時我只注意到部署和服務器崩潰時的錯誤。

Answer 1

您可以確保您的腳本不被抓住了「uncaughtException」與process.on('uncaughtException', callback)停止，就像這樣：

process.on('uncaughtException', function (exception) { 
    // handle or ignore error 
    console.log(exception); 
}); 

setInterval(function() { 
    console.log('tick, even after error'); 
}, 1000); 

a += 1;