问题描述：循环picker选择器，改变一个下拉框选项，导致全部下拉框选项改变。

解决方法：

1、页面内容：

<view wx:for="{{repairDevice}}" wx:key> 
        <view class="cu-form-group">
          <view class="title">车辆维修部位</view>
          <picker data-index="{{index}}"  bindchange="repairChange" data-id="{{item.id}}" value="{{item.id}}"  range="{{repairParts}}" range-key='partName'>
            <view class="picker">
              {{item.id==0'请选择车辆维修部位':repairParts[item.idIndex].partName}}
            </view>
          </picker>
        </view>
        <view class="cu-form-group-A" data-index="{{index}}" data-tag="before_change_code" bindtap='scanCodeBefore'>
          <view class="title">解绑</view>
          <input placeholder="解绑" value="{{item.before_change_code}}" disabled='true'></input>
          <text class="icon-scan text-blue"></text>
        </view>
        <view class="cu-form-group-A" data-index="{{index}}" data-tag="after_change_code" bindtap='scanCodeAfter'>
          <view class="title">绑定</view>
          <input placeholder="绑定" value="{{item.after_change_code}}" disabled='true'></input>
          <text class="icon-scan text-blue"></text>
        </view>
</view>

2、数据格式

repairDevice数据格式：

[{
      name: '',  //维修部分名称
      id: 0,      //维修部分ID
      idIndex:0,//很重要 记录repairParts数据下标
      before_change_code: '', //解绑编码
      after_change_code: '',  //绑定编码
}]

picker选择器数据：此处需要指定range-key

[
{id: "1", partName: "动力电池"},
{id: "2", partName: "驱动电机"},
{id: "3", partName: "整车控制器"},
{id: "4", partName: "电机控制器"}
]

3、触发事件

/****溯源维修部位选择 */
  repairChange(e) {
    let that = this
    let index = e.currentTarget.dataset.index;
    let repairDevice = that.data.repairDevice;
    //获取配件的id,name赋值给遍历的数据repairDevice
    repairDevice[index].id = that.data.repairParts[e.detail.value].id
    repairDevice[index].idIndex=e.detail.value
    repairDevice[index].name = that.data.repairParts[e.detail.value].partName,
      that.setData({
        repairDevice: repairDevice
      })
  },