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@yangfch3
Last active December 17, 2016 14:57
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一段讲解使用 JS 实现 OOP 的代码实例
function inheritPrototype(subType, superType) {
if (Object.create) {
// 利用 Object.create 的特性实现 __proto__ 指针的正确指向,完美
subType.prototype = Object.create(superType.prototype);
subType.prototype.constructor = subType;
} else {
function F() {}
F.prototype = superType.prototype;
var prototype = new F();
prototype.constructor = subType;
subType.prototype = prototype;
}
}
var Employee = (function(){
var _next_id = 1;
var _employeeCount = 0;
function Employee(name, salary, year, month, day) {
var _this = this;
var _id = _next_id;
_this.name = name;
_this.salary = salary;
_this.post = "Employee";
_this.hireDay = new Date(year, month, day);
_next_id++;
_employeeCount++;
}
Employee.prototype.getId = function () {
return this._id;
};
Employee.prototype.setId = function () {
alert("员工ID由系统自动生成,不能手动修改");
return false;
};
Employee.prototype.computeSeniority = function() {
return (new Date().getFullYear() - this.hireDay.getFullYear());
};
Employee.getNextId = function() {
return _next_id;
};
Employee.setNextId = function(value) {
alert("Next ID 由系统自动生成,不能手动修改");
return false;
};
Employee.getCounts = function() {
return _employeeCount;
};
return Employee;
})();
var Manager = (function(){
var _managersCount = 0;
function Manager(name, salary, year, month, day, bonus) {
var _this = this;
Employee.call(_this, name, salary, year, month, day);
_this.post = "Manager";
_this.bonus = bonus || 0;
_managersCount++;
}
// 在这里实现继承,而不是在函数外部实现继承,思考为什么?
inheritPrototype(Manager, Employee);
Manager.prototype.setBonus = function (num) {
this.bonus = num;
};
Manager.getNextId = function() {
return Employee.getNextId();
};
Manager.setNextId = function(value) {
return Employee.setNextId(value);
};
Manager.getCounts = function() {
return _managersCount;
};
return Manager;
})();
// 测试代码
var yangfch3 = new Employee("yangfch3", 1234, 2014, 9, 26);
Employee.getCounts();
Employee.getNextId();
Employee.setNextId(1234);
Object.keys(yangfch3);
yangfch3.getId();
yangfch3.setId(4321);
yangfch3.computeSeniority();
yangfch3.bonus;
yangfch3.setBonus;
var Qu = new Manager("Qu", 12345, 2001, 8, 5, 500);
Manager.getCounts();
Manager.getNextId();
Manager.setNextId(1234);
Object.keys(Qu);
Qu.getId();
Qu.setId(4321);
Qu.computeSeniority();
Qu.bonus;
Qu.setBonus(1111);
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