ES6模块化

前言

语法:import export (注意有无default)

环境:babel编译ES6语法,模块化可用webpack 和rollup

ES6 Class本身是个 语法糖,实际系统默认帮我们转成JS的构造函数

 

JS构造函数方式:

 

class Hello(x,y){
this.x=x;
this.y=y;
}
Hello.protoype.add=function(){
return this.x +this.y;
}
const m =new Hello(2,3);
console.log(m.add()); // 5
typeof Hello === "function" . //true
Hello === Hello.prototype.constructor //true
Hello.__proto__ === Hello.prototype //true

 

ES6书写方式:

 

export class Hello() {
constructor(x,y){
this.x = x;
this.y = y;
}
add() {
return this.x +this.y;
}
}
const m =new Hello(2,3);
console.log(m.add()); // 5
typeof Hello === "function" . //true
Hello === Hello.prototype.constructor //true
Hello.__proto__ === Hello.prototype //true