es6习惯

常用es6特性
let, const, class, extends, super, arrow functions, template string, destructuring, default, rest arguments
let声明变量只在作用域块中有效
const声明常量，不会变
class, extends, super
class声明一个对象
extends子类继承父类
super方法在子类构造器中调用，让子类指向父级，否则子类没有自己的this对象

自己编个小例子

class people{//创建父类
  constructor(){
    this.name="peoplename";
    this.sex="peoplesex";
    this.age="100";
  },
  buildpeople(who){
     console.log(who+"buiold"+this.name+"sex:"+this.sex+"age:"+this.age)
  }
 }
 let people=new people()
 people.buildpeople("god")
 
 class lijinlong extends people(){//子类继承父类
    constructor(){
     super();
     this.name="lijinling";
     this.sex="man";
     this.age="24";
    }
 }
 let lijinling = new lijinlong();
 lijinling.buildpeople("parents");

 arrow function(箭头函数)\
 (参数)=>{函数主体}
 
 
 template string(模板字符串插入)
 通常的字符串拼接变量为："wodemingzi"+name+"
 es6可以这样`wodemingzi${name}`
 用反引号标示起始，用${}包裹变量
 
 destructuring解构?
 let cat = 'ken'
let dog = 'lili'
let zoo = {cat, dog}


let dog = {type: 'animal', many: 2}
let { type, many} = dog
console.log(type, many)   //animal 2
个人感觉和with很像，直接将键名拿出来就能取到值




default默认值
可以直接在函数参数设置默认值
function li(name="lijinlong"){
console,.log(name)
}
li();