Component template should contain exactly one root element.

今天在写关于嵌套路由的示例的时候，项目一直报错，提示 Component template should contain exactly one root element. If you are using v-if on multiple elements, use v-else-if to chain them instead.，项目报错的代码如下 对于这个错误一直百思不得其解，后来上网查了资

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