Function.prototype.method = function(name,fn){
this.prototype[name] = fn;
return this;
}
Function.method('inherits',(function(){
function mix(a,b){
for(var i in b){
//replace
if(typeof a[i] == 'undefined'){
a[i] = b[i];
} 
}
}
return function(Parent){
var fn = function(){};
mix(this.prototype,Parent.prototype);
mix(this,Parent);
this.__super__ = Parent;
//static method
//object.__super__.demo
 
//prototype method
//object.__super__.prototype.hidden
return this;
};
})());
 
 
var a = function(){};
var b = function(){};
var c = function(){};
var d = function(){};
a.prototype.show = function(){
console.log('a show');
};
b.prototype.hidden = function(){
console.log('b hidden');
};
a.test = function(){
console.log('a test');
};
b.demo = function(){
console.log('b demo');
};
 
//usage
b.inherits(a);
c.inherits(a);
d.inherits(b);