arr.sort(); var answer = '欢迎' + arr.slice(0,arr.length - 1) + '和' + arr.slice(arr.length - 1) + '同学'; alert(answer);
```
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末将
arr.sort(); var answer = '欢迎' + arr.slice(0,arr.length - 1) + '和' + arr.slice(arr.length - 1) + '同学'; alert(answer);
```