Component template should contain exactly one root

Component template should contain exactly one root

组件模板应该只包含一个根

如下代码是错误的，会提示以上错误，需要添加一个根元素：

<template>
    <Button>Default</Button>
    <Button type="primary">{{Primary}}</Button>
    <Button type="dashed">{{Dashed}}</Button>
    <Button type="text">{{Text}}</Button>
    <br><br>
    <Button type="info">{{Info}}</Button>
    <Button type="success">{{Success}}</Button>
    <Button type="warning">{{Warning}}</Button>
    <Button type="error">{{Error}}</Button>
</template>

需要修改为：

<template>
  <div >
    <Button>Default</Button>
    <Button type="primary">{{Primary}}</Button>
    <Button type="dashed">{{Dashed}}</Button>
    <Button type="text">{{Text}}</Button>
    <br><br>
    <Button type="info">{{Info}}</Button>
    <Button type="success">{{Success}}</Button>
    <Button type="warning">{{Warning}}</Button>
    <Button type="error">{{Error}}</Button>
  </div>
</template>

可参考Vue说明：单个根元素