向下函数的代码里面的board[k]报错，我输出后显示undefined，为什么会这样，左上右都是正常的
显示报错是：
index.js:188 Uncaught TypeError: Cannot read properties of undefined (reading '0')
at moveDown (index.js:188:18)
at HTMLBodyElement.<anonymous> (index.js:52:8)
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显示报错是：
index.js:188 Uncaught TypeError: Cannot read properties of undefined (reading '0')
at moveDown (index.js:188:18)
at HTMLBodyElement.<anonymous> (index.js:52:8)
2022-02-12
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