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在一个无限网格里同步局部网格数据的方法
移动到局部区域的时候，由于回收算法，当前展示的网格部分或全部会同时调用renderCell方法。renderCell方法会传入columnIndex和rowIndex，在正常情况下，所有的columnIndex可以构成一个number为元素的数组，且元素是连续的，总数一般小于20，rowIndex同理。这样的话renderCell在网格移动过程中大约会被调用20到400次。
renderCell({columnIndex:1, rowIndex:1})
renderCell({columnIndex:1, rowIndex:2})
renderCell({columnIndex:1, rowIndex:3})
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