wangxiaoyugg / learn-react-redux Goto Github PK

块级作用域 let/const for(let i=0;i<10;i++){};
字符串扩展 let name='小明';`hello${name}`
函数扩展 箭头函数 （）=> {} setTimeout; x=>x*3
默认参数 (name='demo')=>{console.log(`hello ${name}`)};
展开符 hello = (name1,name2) => {console.log(name1,name2)};
let arr= ['demo1','demo2'];
hello.apply(null,arr);
hello(...arr);

对象展开符 obj = {name:'demo',course:'react app'};
Object.keys(obj);
Object.keys(obj);
Object.values(obj);
Object.entries(obj);

const name = 'imooc';
const obj = {
	name,
	[name]:'hello',
	hello:function(){},
	hello1(){}
}
console.log(obj)

const obj2 = {type:"IT,name:'rake'};
console.log(...obj,...obj2,date:'2017');

解构赋值
const arr = ['hello','imooc'];
let arg1 = arr[0];
let arg2 = arr[1];
let {a1,a2} = arr;
console.log(a1,'|',a2);
同理对象可以取值

class 类
class Demo {
	constructor(){
		this.name = 'demo'
	}
	sayhello(){
		console.log(`hello ${this.name}`)
	}
} 
const demo = new Demo();
demo.sayhello();

数据结构
Set 重点研究
Map
Symbol

模块化机制 import export
//demo1.js
export const name='demo';
export function sayHello(){};
export default course = "React";
//demo2.js
import {name,sayHello} from './demo1.js'
import course from './demo1.js'
import * as mod1 from './demo1.js'

装饰器
对象扩展，函数绑定
async await
promise
迭代器生成器
代理

数组常用写法
arr.map(v => v*2);
对象的常用写法

参考 www.express.com.cn
npm install nodemon -g
nodemon server.js

const mongoose = require('mongoose');
//链接 mongo 并且使用 imooc集合
const DB_URL = 'mongodb://localhost:27017/imooc';
mongoose.connect(DB_URL);
mongoose.connection.on('connected',function(){
	console.log('connect success')
})

定义文档模型 ，Schema 和 model
const User = mongoose.model('user',new mongoose.Schema({
	user:{type:String,require:true},
	age:{type:Number,require:true}
}))

增删改查
User.create({user:'imooc',age:18},function(err,doc){
	if(!err){
		console.log(doc);
	}else {
		console.log(err)
	}
})

User.find({},function(err,doc){
	res.json(doc);
})
User.findOne({age:18},function(err,doc)=>{

})
User.remove({age:18},function(err,doc)=>{
	console.log(doc);
})
User.update({user:'小明'},{'$set':{age:26}},function(err,doc){
	console.log(doc)
})