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 。)