原型链继承

[Harper-Ge]

Child.prototype = new Parent();
var child1 = new Child();
console.log(child1.getName()) // kevin

这一块好像最后还会打印undefined，是因为es6规则发生了改变吗

[InnocentLi]

class Parent {
    constructor(name = 'Kevin') {
        this.name = name;
    }

    getName() {
        return this.name;
    }
}

class Child extends Parent {
    constructor(name) {
        super(name);
    }
}

var child1 = new Child();
console.log(child1.getName()); // 输出 'Kevin'

你这么写才是es6语法把