vue列表为什么要使用key，欢迎大家一起积极探讨。
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- generate Android Signature and Public Key: Mini Program/Development/Extended/Operating Guide/About packaging/Generate Android Signature and Public Key
- I. Generation Android Signature and Public Key: Mini Program/Development/Extended/Operating Guide/About packaging/Generate Android Signature and Public Key
- III. Will Android Signature and public key App Filing platform: Mini Program/Development/Extended/Operating Guide/About packaging/Generate Android Signature and Public Key
- II. Will Android Sign in the WeChat open platform mobile application: Mini Program/Development/Extended/Operating Guide/About packaging/Generate Android Signature and Public Key
- Added: iOS. Keep on record: Mini Program/Development/Extended/Operating Guide/About packaging/Generate Android Signature and Public Key
使用key给每个节点做一个唯一的标识，Diff算法就可以找到对应的节点，主要是为了高效的更新虚拟DOM。
看看作者怎么说 https://cn.vuejs.org/v2/api/#key