问题： 

（1）版本dd-admin-20220209；

（2）runtime-core.esm-bundler.js:38 [Vue warn]: Unhandled error during execution of component event handler 
  at <ElButton type="primary" loading=false onClick=fn<confirmModifyFn> > 
  at <ElOverlay custom-mask-event="" mask=true overlay-class=undefined  ... > 
  at <BaseTransition onAfterEnter=fn<afterEnter> onAfterLeave=fn<afterLeave> onBeforeLeave=fn<beforeLeave>  ... > 
  at <Transition name="dialog-fade" onAfterEnter=fn<afterEnter> onAfterLeave=fn<afterLeave>  ... > 
  at <ElDialog modelValue=true onUpdate:modelValue=fn title="文件"  ... > 
  at <ImageList> 
  at <ImageManage onVnodeUnmounted=fn<onVnodeUnmounted> ref=Ref< Proxy {…}[[Handler]]: Object[[Target]]: Object[[IsRevoked]]: false > > 
  at <RouterView> 
  at <ElContainer class="content" > 
  at <ElContainer key=0 class="container" > 
  at <App>
warn2 @ runtime-core.esm-bundler.js:38
logError @ runtime-core.esm-bundler.js:212
handleError @ runtime-core.esm-bundler.js:204
callWithErrorHandling @ runtime-core.esm-bundler.js:158
callWithAsyncErrorHandling @ runtime-core.esm-bundler.js:164
emit$1 @ runtime-core.esm-bundler.js:718
（匿名） @ runtime-core.esm-bundler.js:7220
handleClick @ button.vue:142
createElementBlock.onClick._cache.<computed>._cache.<computed> @ button.vue?vue&type=template&id=802c5c76&lang.js:20
callWithErrorHandling @ runtime-core.esm-bundler.js:155
callWithAsyncErrorHandling @ runtime-core.esm-bundler.js:164
invoker @ runtime-dom.esm-bundler.js:366
runtime-core.esm-bundler.js:38 [Vue warn]: Unhandled error during execution of native event handler 
  at <ElButton type="primary" loading=false onClick=fn<confirmModifyFn> > 
  at <ElOverlay custom-mask-event="" mask=true overlay-class=undefined  ... > 
  at <BaseTransition onAfterEnter=fn<afterEnter> onAfterLeave=fn<afterLeave> onBeforeLeave=fn<beforeLeave>  ... > 
  at <Transition name="dialog-fade" onAfterEnter=fn<afterEnter> onAfterLeave=fn<afterLeave>  ... > 
  at <ElDialog modelValue=true onUpdate:modelValue=fn title="文件"  ... > 
  at <ImageList> 
  at <ImageManage onVnodeUnmounted=fn<onVnodeUnmounted> ref=Ref< Proxy {…} > > 
  at <RouterView> 
  at <ElContainer class="content" > 
  at <ElContainer key=0 class="container" > 
  at <App>

解决：

Unhandled error during execution of component event handler 译为： 组件事件处理程序执行期间未处理的错误操作流程。

即： this.$confirm()方法未处理取消按钮触发的事件，所以就需要 catch 去捕捉这个错误即可。

详情转发：2021-11-22 VUE3控制台出现'Unhandled error during execution of component event handler'警告解决方法 - 有匪 - 博客园

备注：

结论：一般开发状态此报警可忽略。