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，...

                                            <table class="javascript"&gt;<tbody><tr class="li1"&gt;

<td class="ln"><pre class="de1">1
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convert num   s   while num     m num     m m     s m . s     num num m     s.toupperCase ...