js之面向对象

面向对象特点继承，封装，多态

废话不多少，直接贴代码

//1.继承
function Person() {
this.title = "Person";
this.sayHello = function() {
console.log("hello " + this.name);
}
}
var person = new Person();

// 原型继承
function Teacher() {
this.name = "teacher";
}
Teacher.prototype = person;
var t = new Teacher();
t.sayHello();

// 伪继承
function Student() {
Person.call(this);// Person.apply(this);
this.name = "student";
}
var s = new Student();
s.sayHello();

// 拷贝
var _toCopy = {
name : "_toCopy"
}
for ( var key in person) {
_toCopy[key] = person[key];
}
_toCopy.sayHello();

// 2.多态
function multiformity(a, b, c, d, e, f, g) {

}
multiformity(1);
multiformity(1, 2);
multiformity(1, 2, "zhansan");

// 接口，JS真的需要接口吗？？
// 模拟java迭代器
Array.prototype.iterator = function() {
var self = this, pos = 0;
return {
hasNext : function() {
return pos < self.length;
},
next : function() {
self[pos++];
}
}
}
var it = [ 12, 3, 4 ].iterator();
while (it.hasNext()) {
it.next();
}