一.父传子和字传父

<template>
  <div>
    <aa :num=" number" />
  </div>
</template>

<script>
import aa from '../aa.vue'
export default {
  name: '',
  components: { aa },
  data() {
    return {
      number: 123
    }
  },
  methods: {
  }
}
</script>

<script>
import aa from '../aa.vue'
export default {
  name: '',
  components: { aa },
  data() {
    return {
      number: 123
    }
  },
  methods: {
  }
}
</script>

<style scoped>

</style>
<template>
  <div>
    <aa :num