code: function() {
          var arr = this.dependencies;
          var v;
          var fns = [this.root];
          for (var i = 0, len = arr.length; i < len; i++) {
              v = arr[i];
              fns.push(this.getFn(v));
          }
          return fns;
      }
docs: 获取factory函数参数数组