比如有一个 object：
let x={'a': {'b': 1, 'c': 2}
let key='a.b'
实际情况可能深度更深，怎么获取到 x.a.b?
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比如有一个 object：
let x={'a': {'b': 1, 'c': 2}
let key='a.b'
实际情况可能深度更深，怎么获取到 x.a.b?
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