//构造函数模式
function Person(name, age, job) {
            this.name = name;
            this.age = age;
            this.job = job;
  
            this.sayName = function () {
                alert(this.name);
            };
}
//调用方式
var p=new Person("张三","21","工作");
p.sayName();
//javascript/6974