javascript - 如何检索POST查询参数？(How to retrieve POST query parameters?)

Question

Here is my simple form:

(这是我的简单形式：)

<form id="loginformA" action="userlogin" method="post">
    <div>
        <label for="email">Email: </label>
        <input type="text" id="email" name="email"></input>
    </div>
<input type="submit" value="Submit"></input>
</form>

Here is my Express.js /Node.js code:

(这是我的Express.js /Node.js代码：)

app.post('/userlogin', function(sReq, sRes){    
    var email = sReq.query.email.;   
}

I tried sReq.query.email or sReq.query['email'] or sReq.params['email'] , etc. None of them work.

(我尝试了sReq.query.email或sReq.query['email']或sReq.params['email']等。它们都不起作用。)

They all return undefined .

(他们都返回undefined 。)

When I change to a Get call, it works, so .. any idea?

(当我改为Get电话时，它有效，所以..任何想法？)

  ask by murvinlai translate from so

Answer 1

Things have changed once again starting Express 4.16.0 , you can now use express.json() and express.urlencoded() just like in Express 3.0 .

(事情已经改变 ，再次启动Express 4.16.0 ，您现在可以像Express 3.0一样使用express.json()和express.urlencoded() 。)

This was different starting Express 4.0 to 4.15 :

(从Express 4.0到4.15开始不同 ：)

$ npm install --save body-parser

and then:

(然后：)

var bodyParser = require('body-parser')
app.use( bodyParser.json() );       // to support JSON-encoded bodies
app.use(bodyParser.urlencoded({     // to support URL-encoded bodies
  extended: true
})); 

The rest is like in Express 3.0 :

(其余的就像在Express 3.0中一样 ：)

Firstly you need to add some middleware to parse the post data of the body.

(首先，您需要添加一些中间件来解析正文的帖子数据。)

Add one or both of the following lines of code:

(添加以下一行或两行代码：)

app.use(express.json());       // to support JSON-encoded bodies
app.use(express.urlencoded()); // to support URL-encoded bodies

Then, in your handler, use the req.body object:

(然后，在您的处理程序中，使用req.body对象：)

// assuming POST: name=foo&color=red            <-- URL encoding
//
// or       POST: {"name":"foo","color":"red"}  <-- JSON encoding

app.post('/test-page', function(req, res) {
    var name = req.body.name,
        color = req.body.color;
    // ...
});

---

Note that the use of express.bodyParser() is not recommended.

(请注意，不建议使用express.bodyParser() 。)

app.use(express.bodyParser());

...is equivalent to:

(......相当于：)

app.use(express.json());
app.use(express.urlencoded());
app.use(express.multipart());

Security concerns exist with express.multipart() , and so it is better to explicitly add support for the specific encoding type(s) you require.

(express.multipart()存在安全问题，因此最好显式添加对所需特定编码类型的支持。)

If you do need multipart encoding (to support uploading files for example) then you should read this .

(如果您确实需要多部分编码（例如，支持上传文件），那么您应该阅读此内容 。)