JavaScript 演练(9). 内部成员、对象成员
MyClass = function () {
var A = 1; //内部成员
B = 2; //内部成员
this.C = 3; //对象成员
}
MyClass.prototype.D = 4; //对象成员(通过原型扩展)
obj = new MyClass();
alert(obj.A); //undefined
alert(obj.B); //undefined
alert(obj.C); //3
alert(obj.D); //4
alert(obj.hasOwnProperty('C')); //true
alert(obj.hasOwnProperty('D')); //false
/* 一个无聊的练习 */
MyClass = function () {
this.A = 1;
}
MyClass.prototype.X = function () {
this.B = 2;
}
MyClass.prototype.Y = function () {
this.Z = function () {
this.C = 3;
}
}
obj = new MyClass();
alert(obj.A); //1
obj1 = new obj.X();
alert(obj1.B); //2
obj2 = new (new obj.Y()).Z();
alert(obj2.C); //3
摘自 万一的 Delphi 博客