Component template should contain exactly one root element.

今天在寫關於嵌套路由的示例的時候，項目一直報錯，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.，項目報錯的代碼如下 對於這個錯誤一直百思不得其解，後來上網查了資

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