console.log(`欢迎${arr.slice(0,arr.length-1).join(',')}和${arr[arr.length-1]}同学！`);
看我头像！
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UZI的粉丝qwq
console.log(`欢迎${arr.slice(0,arr.length-1).join(',')}和${arr[arr.length-1]}同学！`);