如何在 express js 中访问使用 app.set() 设置的变量

Question

如何使用 express 的app.set()访问变量集，例如

app.set('view engine','jade');
app.set('jsDirectory',/js/');

From the guide, i understand that i can access the same using app.get(<key>), but this is the output of console.log(app.get('view engine')).

{ router:
   { app:
      { stack: [Object],
        domain: null,
        _events: [Object],
        _maxListeners: 10,
        _connections: 0,
        connections: [Getter/Setter],
        allowHalfOpen: true,
        _handle: null,
        httpAllowHalfOpen: false,
        cache: {},
        settings: [Object],
        redirects: {},
        isCallbacks: {},
        _locals: [Object],
        dynamicViewHelpers: {},
        errorHandlers: [],
        route: '/',
        routes: [Circular],
        router: [Getter],
        root: 'C:\Users\Shahal\Works\App',
        models: {},
        extensions: {},
        disconnectSchemas: [Function: disconnectSchemas],
        passport: [Object] },
     routes: {},
     params: {},
     _params: [],
     middleware: [Function] } }

Answer 1

They become available through the app.settings object:

app.set('oneSetting', 'one');
app.set('twoSetting', 'two');
app.set('view engine','jade');
console.log(app.settings.oneSetting);
console.log(app.settings.twoSetting);
console.log(app.settings['view engine']);

Answer 2

我知道

这是 2 年前的事了，但它仍然是谷歌上弹出的第一个链接，所以我认为这可能是合适的。

你也可以这样设置你的变量

     app.set('port', 3000);

后来得到它

     app.get('port');

我更喜欢这种方法，因为它更短，更直接。这也是他们在Express 4.x文档中使用的方式。

    app.get(name)
    Returns the value of name app setting, where name is one of strings in the app settings table. 

Answer 3

app.set('view engine','hbs')
**All are correct:**
app.get('view engine')
app.locals.settings['view engine']
app.settings['view engine']