node 報錯信息如下：（ ? ? ? ??Error: Can't set headers after they are sent.? ? at ServerResponse.OutgoingMessage.setHeader (_http_outgoing.js:357:11)? ? at ServerResponse.header (D:\Hexin\FrontEnd\movie\node_modules\express\lib\response.js:730:10)? ? at ServerResponse.send (D:\Hexin\FrontEnd\movie\node_modules\express\lib\response.js:170:12)? ? at done (D:\Hexin\FrontEnd\movie\node_modules\express\lib\response.js:967:10)? ? at Object.exports.renderFile (D:\Hexin\FrontEnd\movie\node_modules\pug\lib\index.js:422:12)? ? at View.exports.__express [as engine] (D:\Hexin\FrontEnd\movie\node_modules\pug\lib\index.js:465:11)? ? at View.render (D:\Hexin\FrontEnd\movie\node_modules\express\lib\view.js:128:8)? ? at tryRender (D:\Hexin\FrontEnd\movie\node_modules\express\lib\application.js:640:10)? ? at EventEmitter.render (D:\Hexin\FrontEnd\movie\node_modules\express\lib\application.js:592:3)? ? at ServerResponse.render (D:\Hexin\FrontEnd\movie\node_modules\express\lib\response.js:971:7)? ? at D:\Hexin\FrontEnd\movie\app.js:90:9? ? at Layer.handle [as handle_request] (D:\Hexin\FrontEnd\movie\node_modules\express\lib\router\layer.js:95:5)? ? at next (D:\Hexin\FrontEnd\movie\node_modules\express\lib\router\route.js:137:13)? ? at Route.dispatch (D:\Hexin\FrontEnd\movie\node_modules\express\lib\router\route.js:112:3)? ? at Layer.handle [as handle_request] (D:\Hexin\FrontEnd\movie\node_modules\express\lib\router\layer.js:95:5)? ? at D:\Hexin\FrontEnd\movie\node_modules\express\lib\router\index.js:281:22GET / 404 76.603 ms - 645瀏覽器報錯：路由：控制：( ? ?
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ruibin
TA貢獻358條經驗 獲得超213個贊
你的express.js有問題。引入router的位置。必須放在錯誤處理之前，也就是說 ：
app.use(bodyParser.urlencoded({extended: false})); ? ?
require('../app/routes/news.server.routes')(app); ? ?
app.use(function(req, res, next) { ? ?
res.status(404); ? ?
try { ? ?
return res.json('NOT FOUND'); ? ?
} catch (e) { ? ?
console.error('404 set header after sent'); ? ?
} ? ?
}); ? ?
app.use(function(err, req, res, next) { ? ?
if (!err) { ? ?
next() ? ?
} else { ? ?
res.status(500); ? ?
try { ? ?
return res.json(err.message || '500 SERVER ERROR'); ? ?
} catch (e) { ? ?
console.error('500 set header after sent'); ? ?
} ? ?
} ? ?
}); ? ?
看見加粗的了嗎？后面兩個錯誤處理必須放在最后，因為路由匹配規則是從上到下，匹配到了就終止！
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