Vue console reported an error

after upgrading the vue virtual keyboard this demo to the vue2 version, the console reports an error when clicking on the keyboard:

according to this article binds props bidirectionally, but the console still reports an error when clicking on the keyboard (the same error as above). I don"t know why the console still reported an error

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May.10,2021

you can take a look at some considerations for vue1 to upgrade vue2
ide/migration.html" rel=" nofollow noreferrer "https://cn.vuejs.org/v2/guide.


overwritten (rewrite) the properties passed from the parent. This is not allowed in vue 2.0. You can use vue syntax sugar. Sync or directly $emit

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