将<template>中的元素用一个大的<div>包起来，这样就可以在其中添加多个元素了
<template> <div> <button @click="addCount">+1(原始) </button> <button @click="addCount(100)">+100(mapMutations)</button> </div> </template>
The template root requires exactly one element.eslint-plugin-vue
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