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搞不懂

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郝宇臻

#1 Created at ... [Delete] [Delete and Lock User]

var x = (arr.concat(5))[4]; 怎么弹出undefined呢？

李_玄旭

#2 Created at ... [Delete] [Delete and Lock User]

不对，你用concat连接起来的是字符串， 应该是这样var x = arr[1][1];

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