alert('欢迎'+arr.sort()[0]+'，'+arr.sort()[1]+'，'+arr.sort()[2]+'和'+arr.sort()[3]+'同学！');
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Craker_ren
alert('欢迎'+arr.sort()[0]+'，'+arr.sort()[1]+'，'+arr.sort()[2]+'和'+arr.sort()[3]+'同学！');