[Vue warn]: Unknown custom element: <sapn> - did you register the component correctly? For recursive components, make sure to provide the "name" option. found in ---> <Evaluate> at src/views/index/

 关于vue报错：

[Vue warn]: Unknown custom element: <sapn> - did you register the component correctly? For recursive components, make sure to provide the "name" option.

found in

---> <Evaluate> at src/views/index/Evaluate.vue
<Index> at src/views/Index.vue
<App> at src/App.vue
<Root>

一般都是标签写错了，比如我的 <span></span> 写成了   <sapn></sapn>