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找出下面代码的规律并且编写一个函数，转换特定的整数到对应的字符串。
1 => A，2 => B，3 => C，...，26 => Z，27 => AA，28 => AB，29 => AC，...，52 => AZ，53 => BA，...
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| function convert(num){ | |
| var result = "" | |
| while(num){ | |
| result = String.fromCharCode( --num % 26 + 65) + result | |
| num = Math.floor(num / 26) | |
| } | |
| return result | |
| } |
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