js寄生组合式继承

function clone (parent, child) {
 // Object.create
 child.prototype = Object.create(parent.prototype);
 child.prototype.constructor = child;
}
function Parent6() {
 this.name = 'parent6';
 this.play = [1, 2, 3];
}
Parent6.prototype.getName = function () {
 return this.name;
}
function Child6() {
 Parent6.call(this);
 this.friends = 'child5';
}
clone(Parent6, Child6);
Child6.prototype.getFriends = function () {
 return this.friends;
}
let person6 = new Child6();