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另:ajax实际代码实现如下
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1) 创建一个后端项目

2) 在routes下创建index.js,users.js,代码如下
// index.js
var express = require('express');
var router = express.Router();
/* GET home page. */
var products = [
{
lid:1,
pname:'笔记本',
price:3400
},
{
lid:2,
pname:'手机',
price:5400
},
{
lid:3,
pname:'iPad',
price:6400
}
]
router.get('/', function(req, res, next) {
res.send(products)
});
router.get('/details', function(req, res, next){
var lid = req.query.lid
res.send(products[lid])
})
module.exports = router;// user.js
var express = require('express');
var router = express.Router();
/* GET users listing. */
router.post('/', function(req, res, next) {
var uname = req.body.uname
var upwd = req.body.upwd
if(uname === 'lili' && upwd === '123456'){
res.send('登陆成功')
}else{
res.send({
code: 0,
message: '用户名或密码错误'
})
}
});
module.exports = router;
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