构造函数模式

 1  function Person(name, age, job) {
 2              this.name = name;
 3              this.age = age;
 4              this.job = job;
 5              this.sayName =  function () {
 6                 console.log( this.name);
 7             };
 8         }
 9 
10          var person1 =  new Person("Nicholas", 29, "Software Engineer");
11          var person2 =  new Person("Greg", 27, "Doctor");
12 
13         person1.sayName();
14         person2.sayName();
15         
16         console.log(person1.constructor);
17         console.log(person2.constructor);
18         console.log(person1  instanceof Object);
19         console.log(person1  instanceof Person);
20         console.log(person2  instanceof Object);
21         console.log(person2  instanceof Person);