Express 路由 参数的获得
req.params
与req.param()方法相比 该属性只能获取 “express路由器传递的参数”, 值得一提的是: 与req.params配合还能在express路由器中玩正则。
示例代码:
1 var express = require('express'); 2 var app = express(); 3 // 地址栏: localhost:3000/user/app ; 4 app.get('/user/:name', function(req, res){ 5 var param = req.params.name; 6 res.send('hello world' + param); // hello world app});
然后看看路由器中神奇的正则使用法,在地址栏输入 localhost:3000/file/javascripts/jquery.js ,
1 var express = require('express'); 2 var app = express(); 3 // 地址栏:localhost:3000/file/javascripts/jquery.js 4 app.get('/file/*', function(req, res){ 5 var param = req.params[0]; 6 res.send(param); //javascripts/jquery.js});
ps: 如果没在路由器设置参数, 则 req.params 获得的值为空对象 {}
req.query
1 示例代码: 2 var express = require('express'); 3 var app = express(); 4 // 地址栏: localhost:3000/search?q=tobi+ferret 5 app.get('/search', function(req, res){ 6 var param = req.query.q;res.send(param); 7 //tobi ferret}); 8 // 地址栏: localhost:3000/shoes?order=desc&shoe[color]=blue&shoe[type]=converse 9 app.get('/shoes', function(req, res){ 10 var _order = req.query.order; 11 var _color = req.query.shoe.color; 12 var _type = req.query.shoe.type; 13 console.log(_order);// descconsole.log(_color); 14 // blueconsole.log(_type); // converse 15 res.send('hello world'); });
ps: 如果地址栏没传递参数, req.query获得的值也是空对象{}
req.body
该属性主要用与post方法时传递参数使用, 用法最为广泛也最为常见,。需要说明下的是使用该属性时, 得先确认app.js中有没有导入“body-parser”, 该模块在express4.x中已经脱离为独立的模块。
前端代码:
<form method="POST" action="add" name="userform" > <input type="text" id="name" name="name" value="xq" class="form-control" /> <input type="text" id="age" name="age" value="12" class="form-control" /> <input type="text" id="job" name="job" value="coder" class="form-control" /> <input type="text" id="hobby" name="hobby" value="run" class="form-control" /> <button type="submit" class="btn btn-primary">提交添加</button></form>
node代码
1 var express = require('express'); 2 var router = express.Router(); 3 var bodyParser = require('body-parser'); 4 5 var app = express(); 6 7 // parse application/x-www-form-urlencoded 8 app.use(bodyParser.urlencoded({ extended: false })); 9 // parse application/json 10 app.use(bodyParser.json()); 11 app.post('/add',urlencodedParser,(function(req, res){ 12 var userObj = {}; 13 userObj = { 14 name: req.body.name, 15 age: req.body.age, 16 job: req.body.job, 17 hobby:req.body.hobby 18 }) 19 console.log(userObj); 20 // {name:'xq',age:'12',job:'coder',hobby:'run'}});
当然,以上都没有涉及文件传输,post方式涉及文件传输需要使用formidable、multer等插件包