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venfiw

venfiw

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let a = {
b: {
c: { d: 1}
}
}

let z = 'c.d';
console.log(a.b[z]) // undefined
console.log(Object.keys(a.b))

你可以通过这个可以看到 a.b 里只有一个键值:'c' 并没有'c.d'
如果你把 c 改为‘c.d' 那么 a.b[z]就可以正常输出
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