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我找到了这个答案，但是即使某些图块无法加载，“空闲”事件也会被触发，有没有办法知道覆盖层的图块是否无法在谷歌地图中加载？
How do I build a single function with which I can convert a nested List to a nested object[] array effectively?
p.s. the depth of the nested List varies.
for example: