选择大量节点的时候，计算选框长宽的函数会重复执行很多次，导致选框渲染速度特别慢(同样的问题，删除函数也是执行了cells个数的2倍)

[xinxincat]

选择大量节点的时候，计算选框长宽的函数会重复执行很多次，导致选框渲染速度特别慢（比如600个节点，函数会执行600次，渲染选框要十几秒）
同样的问题在删除函数中也一样存在，删除2个节点，同一个removeCells()函数执行了节点数量的2倍。删除节点一两千个的时候，浏览器会崩溃

重复执行多次的代码部分：
选择节点函数：

删除函数

以下是视频截图：

20210903140419-.PDF.mp4

[xinxincat]

添加节点，限制函数多次重复执行，暂时缓解这个渲染的性能问题。

[x6-bot]

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