页面部分，wxml中写入以下代码
<picker mode = "selector" bindchange="bindPickerChange" value="{{project[idx].id}}" range="{{project}}" range-key="{{‘val‘}}"> <view class="picker picker1"> {{project[idx].val}}<text class=‘down‘></text> </view> </picker> js部分
data: { idx:0, project:[ { id: 0, val: ‘互联网‘ }, { id: 1, val: ‘建材‘ }, { id: 2, val: ‘法律‘ }, ] }, // 改变下拉选项 bindPickerChange: function (event){ this.setData({ //给变量赋值 idx: event.detail.value, }) }, let id = this.data.project[this.data.idx].id