arr.sort();
console.log('欢迎'+arr.slice(0,arr.length-1).join(',')+'和'+arr.slice(arr.length-1)+'同学!');
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好耶
arr.sort();
console.log('欢迎'+arr.slice(0,arr.length-1).join(',')+'和'+arr.slice(arr.length-1)+'同学!');