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                <!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Vue 测试实例 - 菜鸟教程(runoob.com)</title>
<script src="https://cdn.staticfile.net/vue/3.2.36/vue.global.min.js"></script>
<style>
#app {
  border: dashed black 1px;
  display: inline-block;
  padding-bottom: 10px;
}

#app > button {
  display: block;
  margin: auto;
}

#lightDiv {
  position: relative;
  width: 150px;
  height: 150px;
}

#lightDiv > img {
  position: relative;
  width: 100%;
  height: 100%;
}

#lightDiv > div {
  position: absolute;
  top: 10%;
  left: 10%;
  width: 80%;
  height: 80%;
  border-radius: 50%;
  background-color: yellow;
}
</style>
</head>
<body>
<div id="app">
  <div id="lightDiv">
    <div v-show="lightOn"></div>
    <img src="https://static.jyshare.com/libs/images/svg/img_lightBulb.svg">
  </div>
  <button v-on:click=" lightOn =! lightOn ">开/关</button>
</div>

<script>
const app = Vue.createApp({
  data() {
    return {
      lightOn: false
    }
  }
})
app.mount('#app')
</script>

</body>
</html>
              