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创建对象 --以下内容来自JavaScript高级程序设计
工厂模式
用函数来封装以特定接口创建对象的细节。
function createPerson(name, age, job){ var o = new Object(); o.name = name; o.age = age; o.job = job; o.sayName = function(){ alert(this.name); }; return o; } var person1 = createPerson("Nicholas", 29, "Software Engineer"); var person2 = createPerson("Greg", 27, "Doctor"); person1.sayName(); //"Nicholas" person2.sayName(); //"Greg"
构造函数
用来创建特定类型的对象
function Person(name, age, job){ this.name = name; this.age = age; this.job = job; this.sayName = function(){ alert(this.name); }; } var person1 = new Person("Nicholas", 29, "Software Engineer"); var person2 = new Person("Greg", 27, "Doctor"); person1.sayName(); //"Nicholas" person2.sayName(); //"Greg" alert(person1 instanceof Object); //true alert(person1 instanceof Person); //true alert(person2 instanceof Object); //true alert(person2 instanceof Person); //true alert(person1.constructor == Person); //true alert(person2.constructor == Person); //true //不同实例的同名函数是不相等的，每个方法都要在每个实例上重新创建一次。 alert(person1.sayName == person2.sayName); //false
function Person(name, age, job){ this.name = name; this.age = age; this.job = job; this.sayName = sayName; } //把函数定义转移到构造函数外部，作为全局函数，没有封装性 function sayName(){ alert(this.name); } var person1 = new Person("Nicholas", 29, "Software Engineer"); var person2 = new Person("Greg", 27, "Doctor"); person1.sayName(); //"Nicholas" person2.sayName(); //"Greg" alert(person1 instanceof Object); //true alert(person1 instanceof Person); //true alert(person2 instanceof Object); //true alert(person2 instanceof Person); //true alert(person1.constructor == Person); //true alert(person2.constructor == Person); //true alert(person1.sayName == person2.sayName); //true
JavaScript对象 创建对象 继承,布布扣,bubuko.com
标签：style blog color java io strong ar cti
原文地址：http://www.cnblogs.com/YuanSong/p/3898119.html
