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有意思的function扩展……
<script>
Function.prototype.$bind=function(object)
{
var callback = function (fn) {
return fn;
}
with(object)
{
return eval('callback(' + this.toString() + ')');
}
}
var obj={a:1,b:2};
var f=function (){
a=10;
b=11;
}.$bind(obj);
f();
alert(obj.a);
//----------------------------------------------------------------------------------------------------
G = {};
G.objInstanceOf = function(obj, c){
if(typeof(c) == "string")
return typeof(obj) == c;
if(obj instanceof c || c.__templete__ && obj instanceof c.__templete__)
return true;
var _interfaces = obj && obj.__interfaces__;
if(_interfaces)
for(var i = 0, len = _interfaces; i < len; i++){
if(_interfafces[i] == c)
return true;
}
return false;
};
G.objectAsPrototype = function(obj, c){
c = c || function(){};
c.prototype = obj;
return c;
};
Function.prototype.getPrototypeObject = function(){
var p = this.__templete__ || (this.__templete__= G.objectAsPrototype(this.prototype));
return new p();
};
Function.prototype.$pextends = function(p){
var me = this.$bind({$super:p});
var ins = function()
{
var ret = me.apply(this, arguments);
return ret;
}
ins.prototype = p.getPrototypeObject();
return ins;
};
//--------------------------------------------------------------------------------------------------------
function B(){};
var A = function(){
alert($super);
}.$pextends(B);
var a = new A();
//---------------------------------------------------------------------------------------------------------
Function.prototype.$verify = function(){
var me = this;
var _args = arguments;
//第一范式 [new] T <=> [new] R:function(){donothing, return T.apply},R.prototype = T.prototype
var mins = function(){
for(var i = 0, len = _args.length; i < len; i++)
{
if(!G.objInstanceOf(arguments[i],_args[i])){
throw new TypeError("函数的参数类型不匹配，位置："+(i+1));
}
}
return me.apply(this, arguments);
}
mins.prototype = me.prototype;
return mins;
}
//-------------------------------------------------------------------------------------------------------
var foo = function(x,y){
alert(x+y);
}.$verify("number","number");
foo(1,2);
var foo2 = function(x,y){
x(y);
}.$verify(Function,"number");
//foo("error",2);
foo2(function(x){alert(x)},10);
//foo2("x","y");
var Class3 = function(x,y){
this.x = x;
this.y = y;
}.$verify("number","number");
Class3.prototype.dist2 = function(){return this.x*this.x + this.y*this.y};
var c = new Class3(10,20);
alert(c.dist2());
//--------------------------------------------------------------------------------------------------------
Function.prototype.$staticable = function()
{
var me = this;
var cache = [];
var index = 0;
var mins = function(){
mins.alloc = function(){
cache[index] = cache[index] || {};
return cache[index++];
};
var ret = me.apply(this, arguments);
mins.alloc = null;
index = 0;
return ret;
}
mins.prototype = me.prototype;
return mins;
}
//----------------------------------------------------------------------------------------------------------
var Test = function(){
var x = Test.alloc();
x.a = x.a || 0;
x.a++;
return x.a;
}.$staticable();
for(var i = 0; i < 10; i++)
alert(Test());
//-----------------------------------------------------------------------------------------------------------
Function.prototype.$protected = function(){
var me = this;
var mins = function(){
var p = me.getPrototypeObject();
var ret = function(){}; //create a new object
for(var each in mins.prototype) //clone prototypes
{
if(mins.prototype[each] instanceof Function){
ret.prototype[each] = function(){
return mins.prototype[each].apply(p,arguments); //call by p
}
p[each] = mins.prototype[each];
}
else{
p[each] = ret.prototype[each] = mins.prototype[each];
}
}
me.apply(p,arguments);//clone a new object by me
return new ret(); //return this object;
}
return mins;
}
//----------------------------------------------------------------------------------------------------------------
//将一个类型的this域声明为全部私有
var Test = function(x,y)
{
this.x = x;
this.y = y;
}.$protected();
Test.prototype.getX = function(){
return this.x;
}
var t = new Test(5,10);
alert(t.x);
alert(t.getX());
</script>
提示：您可以先修改部分代码再运行 [[i] 本帖最后由 月影 于 2008-4-12 20:20 编辑 [/i]]
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