每块碎片大小算错了吗?

源代码:

``` javascript
this.debrisWidth = this.contentWidth / this.level.row; //总宽/行?
this.debrisHeight = this.contentHeight / this.level.col; //总高/列?
```

不应该是 `总宽/列 = 每个宽`? `总高 / 行 = 每个高` ?
修正

``` javascript
this.debrisWidth = this.contentWidth / this.level.col; //总宽/列
this.debrisHeight = this.contentHeight / this.level.row; //总高/行
```
