1.修改app.js文件，将其中的user路由去掉。
2.在index路由中配置如下：
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}) ???????} ???})访问：
http://localhost:3000?id=400
以上是express下的ejs模版引擎而言
下面是单个的api页面
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123app.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); nodejs返回接口给前端
原文地址：https://www.cnblogs.com/bgwhite/p/9792665.html