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'欢迎'+arr.sort().slice(0,arr.length-1).join(',')+'和'+arr[arr.length-1]+'同学.'

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多啦没有梦啦

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var arr=['小明','小红','小白','小兰','大军','阿黄'] '欢迎'+arr.sort().slice(0,arr.length-1).join(',')+'和'+arr[arr.length-1]+'同学.'

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