<body>
<div id="app">
<counter></counter>
<counter></counter>
</div>
<template id="counter-template">
<h1>hello</h1>
<button>Submit</button>
</template>
<script>
Vue.component('counter',{
template:'#counter-template'
});
new Vue({
el:"#app"
});
</script>
下面是报错的
（没有找到为什么会报这样的错）
<h1>hello</h1>
<button>Submit</button>
If you are using v-if on multiple elements, use v-else-if to chain them instead.
