微信小程序基于picker实现级联菜单

<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
  })
 },