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Array object Unexpected identifier - Stack Overflow
給我你的懷抱
給我你的懷抱 2017-07-05 10:56:12
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The problem is as shown in the picture,
I don’t understand why undefined is displayed in the program? The console reports an error?

給我你的懷抱
給我你的懷抱

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伊謝爾倫

Your array only has two items, so if you get a[3], the fourth item will of course be undefined...

The same is true for the ob object. It does not have a key of 3, but only a key of 1.

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