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);