vue在子组件向父组件emit时，父组件会警告；

 

 Extraneous non-emits event listeners (swiperimageload) 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. 

 

需要在子组件声明emits：

emits: ["swiperimageload"],

参考：https://stackoverflow.com/questions/64220737/vue-3-emit-warning-extraneous-non-emits-event-listeners