使用正则表达式和javascript将锚点hrefs转换为唯一标记

I have this sample data:

我有这个样本数据:

<products_database>
<product>
         <id>##1234
         <a name ="toy">toy</a>
         <weight>5kg
         <a href ="#block">block</a>
</product>
<product>
          <id>##56789
          <a name ="brick">brick</a>
          <a name ="lego">lego</a>
          <a name ="block">block</a>
          <weight>2kg
          <a href ="#toy">toy</a>
</product>
<product>
          <id>##1357902
          <a href ="#toy">toy</a>
          <a href ="#brick">brick</a>
          <weight>4kg
</product>
</product_database>
<product