Communication between uni-app components (roughly the same as the vue method)

From parent to child:
parent component:

<template>
<view :title=”title”>
</view>
</template>`在这里插入代码片`
<script>
export default {
  name: 'app',
  data () {
    return {
      title: ‘我是父组件’
    }
  }
}
</script>

Sub-components: receive through props

<template>
<view>
这是父组件传递过来的数据{title}
</view>
</template>
<script>
export default {
  name: 'app',
  data () {
return {

      }
  },
props:[‘title’],
}
</script>

Pass from child to parent: (by triggering $emit)
child component:
<

template>
<view>
   <button @click=”send()”>给父组件传值</button>
</view>
</template>
<script>
export default {
  name: 'app',
  data () {
return {
    num: 66
      }
  },
methods:{
send(){
  console.log(‘给父组件传值了’)
this.$emit(‘myEmit’,this.num)//第一个参数是自定义事件，第二个参数是你想传递的值
  }
 }
}
</script>

Parent component: A custom event is defined in the child component, and the parent component must use it where it needs to be used

<template>
<view  @myEmit=”getNum”>
  这是子组件传递过来的值{
   
   {num}}
</view>
</template>
<script>
export default {
  name: 'app',
  data () {
return {
num: 0 // 也可以把子组件传递过来的值存储起来,默认是0 ，传值过后值发生改变
       }
  },
methods:{
// 通过形参接收子组件传递过来的值
getNun(num){
  console.log(num)
  this.num = num
    }
  }
}
</script>

Brother component pass value:
brother a component

<template>
<view>
<button @click=”addNum()”>我要修改兄弟b组件中的数据</button>
</view>
</template>
<script>
export default {
  name: 'app',
  data () {
return {
    
      }
  },
methods:{
// 通过全局$emit 去触发b组件中的回调函数updateNum,同时还可以传递参数
addNum(){
  uni.$emit(‘updateNum’, 10)
}
}
}
</script>

Brother b component:

<template>
<view>
  这是b中的数据{
   
   {num}}
</view>
</template>
<script>
export default {
  name: 'app',
  data () {
return {
    num:66
      }
  },
Created(){
 uni.$on(‘updateNum’,num = >{
   this.num + = num 
})
}
methods:{
}
}
</script>