小程序组件传值

<!-- 子组件B  wxml -->
<view class="inner">
  {{theIdy}}
  <button bindtap='change'>向A中传入参数</button>
</view>

//子组件JS
Component({
  //B在这里接收与data类似可以直接在wxml上用
  properties: {
    theId: {
      type: String,//类型
    }
  },
  data: {

  },
  methods: {
    //触发change事件
    change: function () {
     //通过triggerEvent（给父组件一个事件名称，需要传的参数）传值
      this.triggerEvent('myevent', this.properties.theId);
    }
  }
})

<!-- 父组件 wxml -->
<view>
  <temp theId="{{id}}" bind:myevent="onMyEvent"></temp>
  {{ theId }}
</view>

// 父组件JS

Page({

  data: {
    id: "1",
    theId: 0
  },
  onMyEvent: function (e) {
    //通过事件接收
    this.setData({
      theId: e.detail.theId
    })
  }
})