我面临着从我的URL: localhost:8888/p?tagid=1234获取tagid值的问题。
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'));
});
控制器/ 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;
路线/ index.js:
require('./controllers');
/*
* GET home page.
*/
exports.index = function(req, res) {
res.render('index', {
title: 'Express'
});
};
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+ '!');
});
表达4.倍
要获取URL参数的值，请使用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
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+ '!');
});
