React用map渲染列表數據時的錯誤：Warning: Each child in a list should have a unique "key" prop.
最近在學習React.js小書時，使用第一階段的第13節中使用map函數渲染列表數據報錯 錯誤的意思是列表中的每一個元素都要含有一個惟一的"key"屬性，將代碼做以下修改後再也不報錯。 web
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