如何编写一个vuei组件并打包成umd在浏览器运行？

1、命令行执行vue create mycomponent

版本选择vue2，新建后的src目录

整体项目目录：

2、在src的components下新建HelloWorld.vue

<template>
  <div class="hello">
    <h1>{{ msg }}</h1>
    <p>
      For a guide and recipes on how to configure / customize this project,<br>
      check out the
      <a href="https://cli.vuejs.org" target="_blank" rel="noopener">vue-cli documentation</a>.
    </p>

  </div>
</template>

<script>
export default {
  name: 'HelloWorld',
  props: {
    msg: String
  }
}
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
h3 {
  margin: 40px 0 0;
}
ul {
  list-style-type: none;
  padding: 0;
}
li {
  display: inline-block;
  margin: 0 10px;
}
a {
  color: #42b983;
}
</style>

2、src中的main.js改成一下

import HelloWorld from './components/HelloWorld.vue'

HelloWorld.install = function (Vue) ...

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