微信小程序基于picker的级联菜单

<view >
  <picker bindchange="bindPickerChange0" value="{{brandindex}}" range="{{brands}}">
    <view class="picker">
      品牌：{{brands[brandindex]}}
    </view>
  </picker>
</view>

<view >
  <picker bindchange="bindPickerChange1" value="{{index1}}" range="{{object}}">
    <view class="picker">
      配件类别：{{object[index1]}}
    </view>
  </picker>
</view>

data: {    brands: [],    objectArray: [      {        brand:"博世",        id: 0,        array: ["博世喷油器配件", "博世传感器", "杰克赛尔配件", "博世油泵配件", "博世共轨管配件","博世泵喷嘴"]      },      {        brand: "德尔福",        id: 1,        array: ["德尔福喷油器配件", "德尔福传感器", "德尔福油泵", "德尔福共轨管配件", "德尔福滤清器", "德尔福电脑版ECU", "德尔福机油", "德尔福维修部件"]      },      {        brand: "卡特",        id: 2,        array: ["卡特传感器", "卡特C7C9泵喷嘴","卡特共轨配件"]      },      {        brand: "康明斯",        id: 3,        array: ["西康配件", "东风康明斯","福田康明斯"]      }    ],    object:[],    brandindex:0,    index1:0  },  onLoad:function(){    var objectArray = this.data.objectArray    var brands=[]    for (var i = 0; i < objectArray.length;i++){      brands.push(objectArray[i].brand,)     }    this.setData({ brands: brands ,object: objectArray[this.data.brandindex].array})  },  bindPickerChange0: function (e) {    this.setData({ brandindex: e.detail.value, index1:0 })    var  objectArray = this.data.objectArray    this.setData({ object: objectArray[this.data.brandindex].array})  },  bindPickerChange1: function (e) {    this.setData({      index1: e.detail.value    })  },