// 构造函数Person
function Person(name, age) {
    this.age = age;
    this.name = name;
    this.say = function() {
        console.log("我叫", this.name);
    }
}
// 验证:实例对象p的constructor属性指向构造函数Person
var p = new Person("张三", 18);
console.log(p.constructor === Person); //true,验证结果正确