express中req取参数的3种方法

expressjs里的请求参数，4.x里只有3种

• req.params
• req.body
• req.query

req.params

app.get('/user/:id', function(req, res){ 
res.send('user ' + req.params.id);
});

俗点：取带冒号的参数

req.body

var app = require('express')();
var bodyParser = require('body-parser');
var multer = require('multer'); 
app.use(bodyParser.json()); // for parsing application/json
app.use(bodyParser.urlencoded({ extended: true })); // for parsing application/x-www-form-urlencoded
app.use(multer()); // for parsing multipart/form-data
app.post('/', function (req, res) { 
  console.log(req.body); 
  res.json(req.body);
})

可以肯定的一点是req.body一定是post请求，express里依赖的中间件必须有bodyParser，不然req.body是没有的。

详细的说明在下面的3种post用法里。

req.query

query是querystring

说明req.query不一定是get

// GET /search?q=tobi+ferret
req.query.q
// => "tobi ferret"// 
GET /shoes?order=desc&shoe[color]=blue&shoe[type]=conversereq.query.order
// => "desc"
req.query.shoe.color
// => "blue"
req.query.shoe.type
// => "converse"

因为有变态的写法

// POST /search?q=tobi+ferret
{a:1,b:2}
req.query.q
// => "tobi ferret"

post里看不的，用req.body取。

http://i5ting.github.io/node-http/#10801