如何在Express中获得URL参数?

我在从我的URL: localhost:8888/p?tagid=1234获取tagid的值时遇到了一个问题。

帮助我纠正我的控制器代码。我无法获得tagid值。

我的代码如下:

app.js:

var express = require('express'),
http = require('http'),
path = require('path');
var app = express();
var controller = require('./controller')({
app: app
});


// all environments
app.configure(function() {
app.set('port', process.env.PORT || 8888);
app.use(express.json());
app.use(express.urlencoded());
app.use(express.methodOverride());
app.use(app.router);
app.use(express.static(path.join(__dirname, 'public')));
app.set('view engine', 'jade');
app.set('views', __dirname + '/views');
app.use(app.router);
app.get('/', function(req, res) {
res.render('index');
});
});
http.createServer(app).listen(app.get('port'), function() {
console.log('Express server listening on port ' + app.get('port'));
});

Controller/index.js:

function controller(params) {
var app = params.app;
//var query_string = request.query.query_string;


app.get('/p?tagId=/', function(request, response) {
// userId is a parameter in the url request
response.writeHead(200); // return 200 HTTP OK status
response.end('You are looking for tagId' + request.route.query.tagId);
});
}


module.exports = controller;

routes/index.js:

require('./controllers');
/*
* GET home page.
*/


exports.index = function(req, res) {
res.render('index', {
title: 'Express'
});
};
589382 次浏览
小开
最佳答案

表达4.倍

要获取URL参数的值，使用req.params

app.get('/p/:tagId', function(req, res) {
res.send("tagId is set to " + req.params.tagId);
});


// GET /p/5
// tagId is set to 5

如果你想获得一个查询参数?tagId=5，那么使用req.query

app.get('/p', function(req, res) {
res.send("tagId is set to " + req.query.tagId);
});


// GET /p?tagId=5
// tagId is set to 5

表达3.倍

URL参数

app.get('/p/:tagId', function(req, res) {
res.send("tagId is set to " + req.param("tagId"));
});


// GET /p/5
// tagId is set to 5

查询参数

app.get('/p', function(req, res) {
res.send("tagId is set to " + req.query("tagId"));
});


// GET /p?tagId=5
// tagId is set to 5
小开

你可以做类似req.param('tagId')这样的事情

小开

如果您想在URL中获取查询参数值，请遵循以下代码段

//url.localhost:8888/p?tagid=1234
req.query.tagid
OR
req.param.tagid

如果你想获取URL参数使用快捷参数函数

表达param函数来获取特定的参数。这被认为是中间件，将在调用路由之前运行。

这可以用于验证或抓取有关项目的重要信息。

一个例子是:

// parameter middleware that will run before the next routes
app.param('tagid', function(req, res, next, tagid) {


// check if the tagid exists
// do some validations
// add something to the tagid
var modified = tagid+ '123';


// save name to the request
req.tagid= modified;


next();
});


// http://localhost:8080/api/tags/98
app.get('/api/tags/:tagid', function(req, res) {
// the tagid was found and is available in req.tagid
res.send('New tag id ' + req.tagid+ '!');
});
小开

如果你的路由是这样的:localhost:8888/p?tagid=1234

var tagId = req.query.tagid;
console.log(tagId); // outputs: 1234
console.log(req.query.tagid); // outputs: 1234

否则，如果您的路由看起来像这样，请使用以下代码:localhost:8888/p/1234

var tagId = req.params.tagid;
console.log(tagId); // outputs: 1234
console.log(req.params.tagid); // outputs: 1234

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