I Error reporting scenario

This error occurs when using the El-select component of element-UI in Vue

Operation results: (the following errors will be reported when the interface is initially loaded, and will continue to be reported when clicking El-select and switching El-option)

[Vue warn]: Missing required prop: "value"  

II Error reporting reason

2.1. There is no bidirectional data binding (V-model) in El-select

2.2 El-option does not assign value

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