报如下错误：
Error in v-on handler: "TypeError: Cannot read properties of undefined (reading 'getContext')"

found in

---> <Index> at src/views/employees/index.vue
<AppMain> at src/layout/components/AppMain.vue
<Layout> at src/layout/index.vue
<App> at src/App.vue
<Root>

解决方法 ：
见下图