博客总目录(2007.11.12 - 2010.4.25)

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MyClass = function () {
    this.A = 1;
}

MyClass.prototype.X = function () {
    this.B = 2;
}

MyClass.prototype.Y = function () {
    this.Z = function () {
        this.C = 3;
    }
}

/* 内部对象的 this ? */
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

/* 所属对象的 this ? */
obj = new MyClass();
obj.X();
obj.Y();
obj.Z();
alert(obj.A); //1
alert(obj.B); //2
alert(obj.C); //3

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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

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/* 类属性、对象属性 */
Array.Info1 = "Info1";           //为 Array 增加类属性 Info1
Array.prototype.Info2 = "Info2"; //为 Array 增加对象属性 Info2

arr = [1, 2, 3];
alert(arr.Info1);   //undefined
alert(arr.Info2);   //Info2

alert(Array.Info1); //Info1


/* 类方法、对象方法 */
Array.ShowMessage = function () { alert("ClassMessage"); };
Array.prototype.ShowMessage = function () { alert("ObjectMessage"); };

arr = [1, 2, 3];
arr.ShowMessage();   //ObjectMessage
Array.ShowMessage(); //ClassMessage

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/* 值类型 */
n1 = 123;
n2 = n1;   //赋值
n2 = 456;
alert(n1); //123; n1 != n2

/* 对象类型 */
arr1 = [123];
arr2 = arr1;    //引用
arr2[0] = 456;
alert(arr1[0]); //456; arr1 === arr2

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