Vue3.0 declare it using the "emits" option警告

vue3.0子组件 emit  出现警告

Extraneous non-emits event listeners (okUploadImg) were passed to component but could not be automatically inherited because component renders fragment or text root nodes. If the listener is intended to be a component custom event listener only, declare it using the "emits" option.

解决方法，需要在emits中定义抛出的事件名