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>