function A()
{
this.v1 = 10;
}
A.prototype.print = function()
{
alert(this.v1);
}
function B()
{
}
B.prototype = new A();
new B().print();

function B()
{
this.v2 = 15;
}
B.prototype = new A();
B.prototype.print = function()
{
this.prototype.print.call(this);
alert(this.v2);
}
new B().print();

function C()
{
this.v3 = 20;
}
C.prototype = new B();
C.prototype.print = function()
{
this.prototype.print.call(this);
alert(this.v3);
}
new C().print();

C.prototype.print = function()
{
this.prototype.print.call(this);
alert(this.v3);
}

B.prototype.print = function()
{
this.prototype.print.call(this);
alert(this.v2);
}

B.prototype.print = function()
{
A.prototype.print.call(this);
alert(this.v3);
}
C.prototype.print = function()
{
B.prototype.print.call(this);
alert(this.v3);
}

/*
在使用OOP继承体系时, 首先要定义类, 最后执行extendsOf初始化类, 使用_super引用父类, 如, 使用_this引用本身的方法,
例如:
function Extend2()
{
_super();
}
Extend2.prototype.setValue = function(value)
{
_super.setValue(value);
alert("Extend2:" + value);
}
Extend2.extendsOf(Extend1);

Function.FRBlock = / *("([^"^\\]|\\")*"|'([^'^\\]|\\')*'|\/([^\/^\\]|\\.)*\/) */;
Function.FRSpace = /\s+/g;
Function.FRSign = / ?(^|;|:|<|>|\?|,|\.|\/|\{|\}|\[|\]|\-|\+|\=|\(|\)|\*|\^|\%|\|) ?/g;
Function.FRRefer = /_(super|this)(\.[^(]+)?\(([^\)]*)\)/;
Function.prototype.FCompile = function(name)
{
//检查是类的构造函数还是类的属性, name参数为空表示是构造函数
if (name)
{
//类的属性不是函数实现, 直接赋值到子类后退出
if (typeof this.prototype[name] != "function")
{
window[this.FClassName].prototype[name] = this.prototype[name];
return;
}
var s = this.prototype[name].toString();
}
else
{
var s = this.toString();
}
var b = "";
var r;
//过滤空白字符
while (r = Function.FRBlock.exec(s))
{
s = RegExp.rightContext;
b += RegExp.leftContext.replace(Function.FRSpace, " ").replace(Function.FRSign, "$1") + r[1];
}
b += s.replace(Function.FRSpace, " ").replace(Function.FRSign, "$1");
var i = b.indexOf("(");
var j = b.indexOf(")", i);
if (!name)
{
this.FClassName = b.substring(9, i);
}
var cn = this.FClassName;
var arg = b.substring(i + 1, j);
s = b.substring(j + 2, b.length - 1);
b = "";
//进行调用转义, 将_super,_this替换为指定的方法
for (var n = 0; r = Function.FRRefer.exec(s); n++)
{
if (r[2])
{
if (!name && !n)
{
b = this.FSuperClass.FClassName + ".apply(this,arguments);";
}
r[2] = ".prototype" + r[2];
}
else if (r[1] == "this")
{
//JS函数不区分参数的差异, 构造函数不允许递归调用自身
throw "Constructor call mustn't be \"_this();\" in a constructor";
}
else if (name || RegExp.leftContext)
{
throw "Constructor call must be the first statement in a constructor";
}
else
{
r[2] = "";
}
s = RegExp.rightContext;
b += RegExp.leftContext + (r[1] == "this" ? cn : this.FSuperClass.FClassName) + r[2] + (r[3] ? ".call(this," + r[3] + ")" : ".apply(this,arguments)");
}
if (n)
{
b += s;
}
else if (name)
{
//没有针对_this,_super的调用, 不用编译
window[cn].prototype[name] = this.prototype[name];
return;
}
else
{
//没有对父类构造函数的调用时, 自动添加
b = this.FSuperClass.FClassName + ".apply(this,arguments);" + s;
}
//编译结果赋值
if (name)
{
eval(cn + ".prototype." + name + "=function(" + arg + "){" + b + "}");
}
else
{
eval(cn + "=function(" + arg + "){" + b + ";if(this.constructor==" + cn + ")" + cn + "._" + cn + ".apply(this,arguments);}");
window[cn].FClassName = cn;
}
}
Function.prototype.extendsOf = function(superClass)
{
this.FSuperClass = superClass;
//编译类的全部函数
this.FCompile();
for (var name in this.prototype)
{
this.FCompile(name);
}
var clazz = window[this.FClassName];
clazz.FSuperClass = superClass;
//复制父类中子类没有实现的函数和属性
var prototype = clazz.prototype;
for (var name in superClass.prototype)
{
if (!prototype[name])
{
prototype[name] = superClass.prototype[name];
}
}
//复制初始化方法, 形式如Object._Object
for (var c = this; ; c = c.FSuperClass)
{
if (c["_" + c.FClassName])
{
clazz["_" + clazz.FClassName] = c["_" + c.FClassName];
return;
}
}
}
/*
内置Object类为OOP提供的支持
*/
Object.FClassName = "Object";
Object._Object = Function.Instance;
Object.prototype.instanceOf = function(clazz)
{
for (var c = this.constructor; c; c = c.FSuperClass)
{
if (c === clazz)
{
return true;
}
}
return false;
}