Avoid mutating a prop directly since the value will be overwritten whenever the parent component…… - 代码天地

Avoid mutating a prop directly since the value will be overwritten whenever the parent component……

其他 2021-03-09 07:43:09 阅读次数: 0

报错截图：

在这里插入图片描述

报错原因：

官方解释：所有的 prop 都使得其父子 prop 之间形成了一个单向下行绑定：父级 prop 的更新会向下流动到子组件中，但是反过来则不行。这样会防止从子组件意外改变父级组件的状态，从而导致你的应用的数据流向难以理解。

即在本项目中，子组件直接对父组件的 current 进行了操作

解决办法：

定义一个本地的 data 属性并将这个 prop 用作其初始值，即需要在子组件中将 current 赋值给 currentNum，再对 currentNum 进行操作

相关代码：

在这里插入图片描述

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