<view class="list" wx:for="{{list}}" wx:for-index="key" wx:for-item="val">

    <view class="label">标题内容</view>

    <picker mode="selector" value="{{val.express.key}}" data-key="{{key}}" range="{{express}}" range-key="name" bindchange="express_change">

            {{val.express.name ||'点击选择快递'}}

    </picker>

</view>

​

<button bind:tap="item_add">添加项目</button>

​

​

Page({

  data: {

    list :[

        {express : {key:0,name:''},address: ''},

    ],

    express : [

        {name:'中通1'},

        {name:'中通2'},

        {name:'中通3'},

        {name:'中通4'}

    ]

  },

  onLoad() {

  },

  item_add : function(){

        let items = this.data.list;

        let item = {express:{key:-1,name:''},address:'' };

        items.push(item);

        this.setData({

            list : items

        })

  },

  express_change:function(e){

      console.log(e);

      let express = this.data.express[e.detail.value];

      let key = e.target.dataset.key;

      let list = this.data.list;

      list[key].express = {key : key, name:express.name};

      this.setData({

          list :list

      })

  }

})