Node.js中的express框架获取参数

express获取参数有三种方法：

req.query 适合 http://localhost:3000/form?num=8888
req.body 适合http://localhost:3000/form，然后Post一个num为tinyphp
req.params 适合获取form后的num：http://localhost:3000/form/num

一、GET

app.js

var express = require('express');
var app = express();

app.use(express.static('public'));
//获取数据
app.get('/form', function(req, res) {
    var num = req.query.num;
    res.send("你获取的get数据为:" + num);
});

//设置监听端口
app.listen(3000);

public/test.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <script src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
</head>
<body>
        <div id="box"></div>
        <form action="/form" method="get">
        <input type="text" name="num" value="8888">
        <input type="submit" value="提交">
        </form>

</body>
</html>

二、POST

解析post数据需要用到body-parser

npm body-parser --save

app.js

var express = require('express');
var app = express();
//引入body-parser
var bodyParser = require('body-parser');
app.use(express.static('public'));

//需要use的
app.use(bodyParser.json()); // for parsing application/json
app.use(bodyParser.urlencoded({
    extended: true
})); // for parsing application/x-www-form-urlencoded

//获取数据
app.post('/form', function(req, res) {
    var num = req.body.num;
    res.send("你获取的post数据为:" + num);
});

//设置监听端口
app.listen(3000);

public/test.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <script src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
</head>
<body>
        <div id="box"></div>
        <form action="/form" method="post">
        <input type="text" name="num" value="tinyphp">
        <input type="submit" value="提交">
        </form>

</body>
</html>

三、获取路径

app.js

var express = require('express');
var app = express();

//获取数据
app.get('/form/:num', function(req, res) {
    var num = req.params.num;
    res.send("你获取到form/后的参数:" + num);
});

//设置监听端口
app.listen(3000);