指针

指针的坑：

var removeFilter = function(method, filter){
                _initHook(method);
                var filters = method['_hooks_'].filters;
                if(filters.length > 0){
                    if(filter != undefined){
                        for(var i in filters){
                            if(filters[i] == filter){
                                delete filters[i];
                                return;
                            }
                        }
                    }else{
                        //filters = [];
                        //有坑啊，不能用filters。应该将method['_hooks_'].filters指向空地址
                        method['_hooks_'].filters = [];
                    }
                }
            }