SOURCE

<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<!-- 引入样式 -->
<link rel="stylesheet" href="https://unpkg.com/element-ui/lib/theme-chalk/index.css">
<!-- 引入组件库 -->
<script src="https://unpkg.com/element-ui/lib/index.js"></script>

<div id="app">
    <el-button>12</el-button>
    1414
</div>

<script>
    let vm = new Vue({
        el: '#app'
    })
</script>