寄生式继承
function obj(o){
function F(){}
F.prototype=
o;
return new F();
}
function createPerson(orig){
var thePerson=
obj(orig);
thePerson.sayHi=
function(){
console.log('hi'
);
};
thePerson.sex='female'
;
return thePerson;
}
var person=
{
name:"zhangsan"
,
age:18
,
friends:['Lisi','wangwu','zhaoliu'
]
};
var newPerson=
createPerson(person);
newPerson.sayHi(); //hi
console.lo g(newPerson.friends);
//["Lisi", "wangwu", "zhaoliu"]
console.log(newPerson.sex);
//female
函数不能复用，降低效率，但新对象不仅具有person的属性和方法，还有自己的方法。
寄生组合式继承
function obj(o){
function F(){}
F.prototype=
o;
return new F();
}
function inheritPro(subType,superType){
var pro=
obj(superType.prototype);
pro.constructor=
subType;
subType.prototype=
pro;
}
function SuperType(name){
this.name=
name;
this.friends=['Lisi','wangwu','zhaoliu'
];
}
SuperType.prototype.sayName=
function(){
console.log(this.name);
};
function SubType(name,age){
SuperType.call(this,name);
this.age=
age;
};
inheritPro(SubType,SuperType);
var thePerson=
new SubType('sunmenghua',24
);
console.log(thePerson.age); //24
console.log(thePerson.friends)
// ["Lisi", "wangwu", "zhaoliu"]
计生组合式继承是引用类型最理想的继承
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