console.log(`欢迎${arr.sort().slice(0, arr.length - 1).join("，")}和${arr.sort().slice(arr.length - 1)}同学！`);
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whx
console.log(`欢迎${arr.sort().slice(0, arr.length - 1).join("，")}和${arr.sort().slice(arr.length - 1)}同学！`);