<!-- 子组件 -->
<template>
  <div>
    <h3>年龄{{ myAge }}</h3>
    <button @click="onClick">尝试修改props内容</button>
  </div>
</template>

<script>
export default {
  props: ["age"],
  data() {
    return {
      myAge: this.age,
    };
  },
  methods: {
    onClick() {
      this.myAge++;
    },
  },
};
</script>