arr = arr.sort(); console.log(欢迎${arr.slice(0,3).join(',')}和${arr[arr.length-1]}同学!);
欢迎${arr.slice(0,3).join(',')}和${arr[arr.length-1]}同学!
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脱离语言
arr = arr.sort(); console.log(
欢迎${arr.slice(0,3).join(',')}和${arr[arr.length-1]}同学!
);