javascript里的继承实现过程

function Person(name, age){    this.name = name;    this.age = age;   }function Man(name , age){    Person.call(name,age);    console.dir("------");}Man.prototype = Object.create(Person.prototype);Man.prototype.constructor = Man;console.dir(Man);var man1 = new Man('m1',23);console.dir(man1 instanceof Man);console.dir(man1 instanceof Person);