arr[arr.length-1] = '和'+arr[arr.length-1] console.log(欢迎${arr.join(',')}同学);
欢迎${arr.join(',')}同学
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树深不见鹿c
arr[arr.length-1] = '和'+arr[arr.length-1] console.log(
欢迎${arr.join(',')}同学);