在子组件直接修改父组件的报错信息：vue.js:597 [Vue warn]: Avoid mutating a prop directly since the value will be ov...
在vue中子组件是不允许直接修改父组件传过来的数据，因为如果父组件传过来的数据如果是数组或者是对象的数据的话，在 子组件中直接修改传过来数据的话，会影响到其他组件的数据，所以要在子组件data数据里定义一个变量来保存父组件传过来的 数据。 但是这样的话，定义的局部变量ttt只能接受conten的初始值，当父组件要传递的值发生变化时，ttt就无法接收到最新的值了 我们可以定一个计算属性，watc
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