构造函数模式

function Person(name,age){
    this.name = name;
    this.age = age;
}
Person.prototype = {
    constructor: Person;
    printName: function(){
        console.log(this.name);
    },
    printAge: function(){
        console.log(this.age);
    }
}

var person = new Person('xin', 22);
person.printName(); // xin
person.printAge(); // 22

.

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