MooTools有一个很好的功能,可以让您创建自己的Class mutator.例如,为了引用特定的类方法添加一个记录器,你可以这么做：

// define the mutator as 'Monitor',use as Mointor: ['methodname','method2'...]
Class.Mutators.Monitor = function(methods){
    if (!this.prototype.initialize) this.implement('initialize',function(){});
    return Array.from(methods).concat(this.prototype.Monitor || []);
};

Class.Mutators.initialize = function(initialize){
    return function(){
        Array.from(this.Monitor).each(function(name){
           var original = this[name];
           if (original) this[name] = function() {
               console.log("[LOG] " + name,"[SCOPE]:",this,"[ARGS]",arguments);
               original.apply(this,arguments);
           }
        },this);
        return initialize.apply(this,arguments);
    };
};

然后在类中：

var foo = new Class({

    Monitor: 'bar',initialize: function() {
        this.bar("mootools");
    },bar: function(what) {
        alert(what);
    }

});

var f = new foo();
f.bar.call({hi:"there from a custom scope"},"scope 2");

尝试jsfiddle：http://jsfiddle.net/BMsZ7/2/

这个小宝石一直有助于我在一个HUUUGE异步webapp中捕获嵌套的bugfoot竞争条件问题,否则会很难跟踪.