一、工厂模式

缺点：没有解决对象识别的问题

优点：解决了创建多个相似对象的问题

function createPerson(name,age,job){            var o = new Object();            o.name = name;            o.age = age;            o.job = job;            o.sayname = function(){                console.log(this.name);            };            return o;       }        var person1 = createPerson("qqq",21,"sss");        person1.sayname();//qqq        var person2 = createPerson("aaa",22,"sas");        person2.sayname();//aaa        console.log(person1 instanceof createPerson);//false        console.log(person2 instanceof createPerson);//false        console.log(person1.sayname === person2.sayname);//false

 

 

 

二、构造函数模式

优点：可以用来创建特定类型的对象，自定义的构造函数

缺点：每个

方法都要在每个实例上重新创建一遍。2个sayName方法不是同一个Function的实例。

function Person(name,age,job){            this.name = name;            this.age = age;            this.job = job;            this.sayname = function(){                console.log(this.name);            };       }        var person1 = new Person("qqq",21,"sss");        person1.sayname();//qqq        var person2 = new Person("aaa",22,"sas");        person2.sayname();//aaa        console.log(person1 instanceof Person);//true        console.log(person2 instanceof Person);//true        console.log(person1.sayname === person2.sayname);//false

 

三、原型模式

优点：可以让所有对象实例共享它所包含的属性和方法。就是直接在原型对象中定义对象实例信息。

缺点：省略了构造函数传递初始化参数，结果所有实例在默认情况下都将取得相同的属性！

 

function Person(){        }        Person.prototype.name = "unio";        Person.prototype.age = "14";        Person.prototype.job = "monitor";        Person.prototype.sayname = function(){               console.log(this.name);        };        var person1 = new Person();        person1.sayname();//unio        var person2 = new Person();        person2.sayname();//unio        console.log(person1 instanceof Person);//true        console.log(person2 instanceof Person);//true        console.log(person1.sayname === person2.sayname);//true

 

四、组合使用构造函数和原型模式

 优点：去掉构造模式和原型模式的缺点，集结二者之优点

function Person(name,age,job){             this.name = name;             this.age = age;             this.job = job;        }        Person.prototype.sayname = function(){               console.log(this.name);        };        var person1 = new Person("qqq",21,"sss");        person1.sayname();//qqq        var person2 = new Person("aaa",22,"sas");        person2.sayname();//aaa                console.log(person1 instanceof Person);//true        console.log(person2 instanceof Person);//true        console.log(person1.sayname === person2.sayname);//true

 

 

五、动态原型模式

 

function Person(name,age,job){             this.name = name;             this.age = age;             this.job = job;             if(typeof this.sayname != "function"){                 Person.prototype.sayname = function(){                       console.log(this.name);                };             }        }        var person1 = new Person("qqq",21,"sss");        person1.sayname();//qqq        var person2 = new Person("aaa",22,"sas");        person2.sayname();//aaa        console.log(person1 instanceof Person);//true        console.log(person2 instanceof Person);//true        console.log(person1.sayname === person2.sayname);//true