el-page-header：Unknown custom element

[github-afeng]

试图增加如下功能：
<el-page-header @back="goBack" content="详情页面">

<script> export default { methods: { goBack() { console.log('go back'); } } } </script>

遇到问题：
vue.runtime.esm.js:619 [Vue warn]: Unknown custom element: - did you register the component correctly? For recursive components, make sure to provide the "name" option.

[github-afeng]

汗！小白...打扰了
更新下element-ui即可