javascript面向对象实例
非私有属性
function Student(name, gender, age, grade, teacher){
this.name = name;
this.gender = gender;
this.age = age;
this.grade = grade;
this.teacher = teacher;
}
var bob = new Student("bob", "male", 15, 10, "Marlow");
alert(bob.age); //输出15
var susan = new Student("susan", "female", 10, 5, "Gresham");
alert(susan.gender); //输出 'female'
var bob = new Student("bob", "male", 15, 10, "Marlow");
alert(bob.age); //输出15 bob.age = 9;
alert(bob.age); //输出9;
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私有属性
function Student(name, gender, age, grade, teacher) {
var studentName = name;
var studentGender = gender;
var studentGrade = grade;
var studentTeacher = teacher;
var studentAge = age;
this.getAge = function() {
return studentAge;
};
this.setAge = function(val){
studentAge = Math.abs(val); //使用绝对值，确保年龄是正值
};
}
var bob = new Student("bob", "male", 15, 10, "Marlow");
alert(bob.studentAge); //未定义，因为年龄在类定义中受私有保护
alert(bob.getAge()); //输出15 bob.setAge(-20); alert(bob.getAge()); //输出20
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动态创建的访问器方法
function Student( properties ){
var $this = this; //将类范围存储到名为$this的变量中
//迭代处理对象的属性
for ( var i in properties ) {
(function(i) {
// 动态创建访问器方法
$this[ "get" + i ] = function(){
return properties[i];
};
})(i);
}
}
// 创建一个新的用户对象实例，并传递属性的对象
var student = new Student({Name: "Bob",Age: 15,Gender: "male"});
alert(student.name); //因属性是私有的而未定义
alert(student.getName()); //输出 "Bob"
alert(student.getAge()); //输出15
alert(student.getGender()); //输出 "male"
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类的继承
function Worker() {
this.getMethods = function(properties, scope)
{ var $this = scope; //将类范围存储到名为$this的变量中
//迭代处理对象的属性
for ( var i in properties ){
(function(i){ // 动态创建访问器方法
$this[ "get" + i ] = function()
{
return properties[i];
}; //动态地创建一个分析整数，并确保是正值的更改器方法。
$this[ "set" + i ] = function(val) {
if(isNaN(val)) {
properties[i] = val;
}else{
properties[i] = Math.abs(val);
}
};
})(i);
}
};
}
// CommissionWorker "子类"和WageWorker "子类"
//继承Worker的属性和方法。
CommissionWorker.prototype = new Worker();
WageWorker.prototype = new Worker();
function CommissionWorker(properties) {
this.getMethods(properties, this);
//计算收入
this.getIncome = function(){
return properties.Sales * properties.Commission;
}
}
//要求有下列属性：薪水、每周小时数、每年周数
function WageWorker(properties) {
this.getMethods(properties, this);
//计算收入
this.getIncome = function() {
return properties.Wage * properties.HoursPerWeek * properties.WeeksPerYear;
}
}
var worker = new WageWorker(Name: "Bob", Wage: 10, HoursPerWeek: 40,WeeksPerYear: 48 });
alert(worker.wage); //未定义。薪水是私有属性。
worker.setWage(20); alert(worker.getName()); //输出 "Bob"
alert(worker.getIncome()); //输出 38,400 (20*40*48)
var worker2 = new CommissionWorker( { Name: "Sue", Commission: .2, Sales: 40000 });
alert(worker2.getName()); //输出 "Sue"
alert(worker2.getIncome()); //输出8000（2% 乘40,000）
