WXML：

 <block wx:for="{{cateItems[curIndex].children}}" wx:key="{{index}}">

          <view style="position:relative">

            <view class="nav_right_items">

              <text>{{item.name}}</text>

              <text style="color:red">￥{{item.price}}/斤</text>

            </view>

            <view class="counts">

              <text class="reduce {{status}}" bindtap="reduce" data-index="{{index}}">-</text>

              <input class="number" value="{{item.num}}" data-index="{{index}}" bindinput="bindValue"></input>

              <text class="add" bindtap="add" data-index="{{index}}">+</text>

            </view>

          </view>

        </block>

JS：

data: {

    arr: ["蔬菜","调味品","米类","面类","油类","干果类","水产类","肉类","杂粮类","冻货类","酒水类","芽菜类","烫菜类"],

    index: 1,

    currentTab: 0,

    cateItems:[

        {

          cate_id:1,

          cate_name:'根茎类',

          children: [

            { 

              child_id: 1, 

              name: '（皱皮）辣椒',

              price: 6,

              num:0

            }, 

            { 

              child_id: 2, 

              name: '黄皮洋葱',

              price: 1.5,

              num:0

            },

            { 

              child_id: 3, 

              name: '苦菊',

              price: 3.5,

              num:0 

            },

            { 

              child_id: 4, 

              name: '蛋皮',

              price: 6,

              num:0

            }

          ]

        },

      curNav:1,

      curIndex:0,

      stasus:"disabled"

  },

add:function(e){

    let index = e.currentTarget.dataset.index;

    var curIndex = this.data.curIndex;

    var children = this.data.cateItems[curIndex].children[index];

    console.log(children)

    var num = children.num;

    var status = num<1?"disabled":"normal";

    num = num + 1;

    console.log(num)

    children.num = num;

    this.setData({

      num:num,

      status:status

    })

    console.log(children)

    console.log(num)

  },

我this.setData里面写的不对吗