simple aop..

aop.js

// AOP简易模型
function Ting() {}

Thing.prototype.doSomething = function(x, y) {
  var result;

	return result;
};

var thing = new Thing;
var origDoSomething = thing.doSomething;

thing.doSomething = function() {
	doSomethingBefore();
	return origDoSomething.apply(this, arguments);
};