Wepy

child1.wpy

<script>
import wepy from 'wepy'
export default class Child1 extends wepy.page {
  props = {
    childId: {
      type: String,
      default: null
    }
  }
  
  onLoad() {
    console.log(this.childId)
  }
}
</script>
<template>

</template>

child2.wpy

<script>
import wepy from 'wepy'
export default class Child2 extends wepy.page {
  props = {
    childId: {
      type: String,
      default: null
    }
  }
  
  onLoad() {
    console.log(this.childId)
  }
}
</script>
<template>

</template>

parent.wpy

<script>
import wepy from 'wepy'
export default class Parent extends wepy.page {
  data = {
    parentId: '2131231231'
  }
}
</script>
<template>
<child1 :childId.sync="parentId" />
<child2 :childId.sync="parentId" />
</template>