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作业

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

alert(欢迎${arr.slice(0, 3).join(',')}和${arr.pop()}同学!);

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

alert(`欢迎${arr.slice(0, 3).join(',')}和${arr.pop()}同学!`);


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