两种get请求传参方式
//angular 前端get请求this.client.get(‘http://localhost:3000/id/tom‘).subscribe(data => { console.log(data); });//nodejs后端响应app.get("/id/:name", function (request, response) { var heroName = request.params.name; //debugger; console.log("name:" + request.params.name); heros.find({name:heroName},function(err,heros){ if(err) return console.error(err); response.send(heros); }); });
另一种：
// client: HttpClient : @angular/common/http this.client.get(‘http://localhost:3000/id‘, { params: { name: ‘tom‘ } }).subscribe(data => { console.log(data); });//var express = require("express"); var app = express();app.get("/id/", function (request, response) { var heroName = request.query.name; console.log("name:" + request.query.name); heros.find({name:heroName},function(err,heros){ if(err) return console.error(err); response.send(heros); }); });
通过Mongoose连接MongoDB,并进行查询和保存数据：
var mongoose=require(‘mongoose‘);mongoose.connect(‘mongodb://localhost/hero‘,{config:{autoIndex:false}}); // 进入mongo命令行 show dbs 将看到herovar db = mongoose.connection;db.on(‘error‘, console.error.bind(console, ‘connection error:‘));db.once(‘open‘, function() { console.log("connection success");});var heroSchema = new mongoose.Schema({ name:String});heroSchema.set(‘autoIndex‘,false);heroSchema.methods.display = function () { console.log(this.name);}var Hero = mongoose.model(‘heros‘, heroSchema); //show collections 将看到heros// 通过model 查询; 在mongo命令行 使用 db.heros.find({name:‘tom‘})Hero.find({name:‘tom‘},function(err,heros){ if(err) return console.error(err); console.log(heros);});//通过model创建theHero并保存到mongodb var theHero = new Hero ({ name: ‘tom‘ });theHero.save(function (err, data) { if (err) return console.error(err); });
另外，解决跨域问题：
//后台设置跨域访问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();});
启动mongodb：
mongod --dbpath d:/test
启动nodejs后端服务,通过nodemon启动，修改test.js代码后自动生效：
nodemon test.js
参考：
