List是用来显示列表的组件，包含一系列相同宽度的列表项，适合连续、多行地呈现同类数据。本文将使用list组件实现字母索引地区列表和可折叠地区列表。
这看似并不是一个很难回答的问题，并且在大多数情况下，我们也并不需要来进行选择，??因为公司中早就有其他人来帮我们选择好了我们要使用的数据存储系统，??但是你有没有想过这种选择是否真的适合我们的系统，??又或者如果我们面对的是一个完全崭新的这种项目，那么这时候需要我们来作出选择时，??我们要如何来在众多的数据存储系统中来选择出最符合我们需要的系统。?
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