[Vue warn]: The data property "obj" is already declared as a prop. Use prop default value instead.

这是一个 Vue 的警告信息，意思是在组件中定义了一个名为 "obj" 的 data 属性，但是这个属性已经被定义为一个 prop，应该使用 prop 的默认值来代替。可能的解决方法是将 "obj" 从 data 属性中移除，或者给它一个默认值。关于具体的代码实现，需要查看组件的代码才能给出更准确的答案。

相关问题

[Vue warn]: The data property "item" is already declared as a prop. Use prop default value instead.

This warning message is generated by Vue.js when a data property is declared with the same name as a prop in the same component. This can cause conflicts and unexpected behavior as the two properties may have different values and can overwrite each other.

To resolve this warning, you can either rename the data property or provide a default value for the prop. Providing a default value for the prop is the recommended approach as it ensures that the prop is always initialized with a value.

For example, if you have a component with a prop named "item" and a data property with the same name, you can provide a default value for the prop like this:

props: {
  item: {
    type: Object,
    default: () => ({})
  }
},

This ensures that the "item" prop is always initialized with an empty object if it is not passed in from the parent component.

[Vue warn]: The data property "fileList" is already declared as a prop. Use prop default value instead. found in

这个警告是 Vue.js 给出的，意思是你定义了一个名为 "fileList" 的 data 属性，但是该属性已经被定义为一个 prop 了。这通常是因为你在组件的 props 中定义了一个名为 "fileList" 的属性，而在组件内部又定义了一个同名的 data 属性。

解决这个警告的方法是使用 prop 的默认值来初始化组件的 "fileList" 数据属性。你可以在组件的 props 中指定 "fileList" 的默认值，例如：

props: {
  fileList: {
    type: Array,
    default: function() {
      return [];
    }
  }
}

这样就可以避免 Vue.js 给出的警告了。