24、Vue3 declare it using the "emits" option警告

Vue3中 子组件通过emit抛出事件 出现如下警告但不影响使用：
Extraneous non-emits event listeners (otherev) 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

案例