es6 class用法

class Person{  
    // 构造  
    constructor(x,y){  
        this.x = x;  
        this.y = y;  
    }  
  
  
    toString(){  
        return (this.x + "的年龄是" +this.y+"岁");  
    }  
}  
export {Person};  

 

//index.js  
import {Person} from './Person';  
let person = new Person('张三',12);  
console.log(person.toString());