扩展expressjs res属性 [英] extend expressjs res property

问题描述

当前，我正在尝试添加错误&通知我的 expressjs 应用程序的功能.我以为是通过致电

Currenty I am trying to add an error & notice function to my expressjs app. I thought that by calling

app.use(function (req, res, next) {
  res.notice = function (msg) {
    res.send([Notice] ' + msg);
  }
});

notice函数将附加到应用程序中存在的所有res对象，使我可以按以下方式使用它:

the notice function would be attached to all res objects present in my application, enabling me to use it as follows:

app.get('something', function (req, res) {
  res.notice('Test');
});

但是，上面的示例不起作用.有什么方法可以完成我想做的事情?

However, the example above does not work. Is there a way to accomplish what I'm trying to do?

推荐答案

您需要在res中添加notice方法之后调用next.

You need to call next after adding notice method to res.

app.use(function (req, res, next) {
  res.notice = function (msg) {
     res.send('[Notice] ' + msg);
  }
  next();
});

并且您需要在路由定义之前添加此中间件.

And you need to add this middleware before routes definition.

更新:

您需要在路由器之前添加中间件.

You need to add your middleware before router.

var express = require('express');
var app = express();

app.use(function (req, res, next) {
    res.notice = function (msg) {
        res.send('[Notice] ' + msg);
    };
    next();
});

app.use(app.router);
app.get('/', function (req, res) {
    res.notice('Test');
});

app.listen(3000);

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