arr=arr.sort();
console.log(`欢迎${arr.slice(0,arr.length-1).join(',')}和${arr.reverse()[0]}同学`);
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rb-h浪子-含笑
arr=arr.sort();
console.log(`欢迎${arr.slice(0,arr.length-1).join(',')}和${arr.reverse()[0]}同学`);