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 。) 与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
