vue组件 data选项

错的

App.vue

<template>
  <div class="app">
    <baseCount></baseCount>
    <baseCount></baseCount>
    <baseCount></baseCount>
  </div>
</template>

<script>
import baseCount from "./components/BaseCount";
export default {
  components: {
    baseCount,
  },
};
</script>

<style>
</style>

BaseCount.vue

<template>
  <div class="base-count">
    <button @click="count--">-</button>
    <span>{{ count }}</span>
    <button @click="count++">+</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      count: 100,
    };
  },
};
</script>

<style>
.base-count {
  margin: 20px;
}
</style>