nodejs返回接口给前端

router.all(‘*‘, function(req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "X-Requested-With");
    res.header("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS");
    res.header("X-Powered-By",‘ 3.2.1‘);
    res.header("Content-Type", "application/json;charset=utf-8");
    next();
});//设置允许跨域访问
    Var obj = [{name:”zhangsna”,age:11,address:”Shanxi”,time:”2018-10-10"}] 
router.get(“/”,(requires,next) => {
        Let id = req.query.id;
        if(id==400) {
            res.send({status:0,data:obj})
        }
    })

var express=require(‘express‘);
var app =express();
//设置跨域访问
app.all(‘*‘, function(req, res, next) {
   res.header("Access-Control-Allow-Origin", "*");
   res.header("Access-Control-Allow-Headers", "X-Requested-With");
   res.header("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS");
   res.header("X-Powered-By",‘ 3.2.1‘);
   res.header("Content-Type", "application/json;charset=utf-8");
   next();
});
var questions=[
{
    data:213,
    num:444,
    age:12
},
{
    data:456,
    num:678,
    age:13
}];
//写个接口123
app.get(‘/123‘,function(req,res){
    res.status(200),
    res.json(questions)
});
//配置服务端口
var server = app.listen(3000, function () {
    var host = server.address().address;
    var port = server.address().port;
    console.log(‘Example app listening at http://%s:%s‘, host, port);