示例：
wxml页面：
<picker name="picker_machine11" class="cybm_pic_1" range="{{categoryList}}" value="{{'categoryid'}}" range-key='name' bindchange="bindChangeCate">
<span class="picker">
<view class='flex-item'>{{showCategory}}</view>
</span>
</picker>
其中，range是数组类型：[{id:'',name:''}]，value为选中后的值，range-key为显示字段，bindchange为绑定事件，绑定事件写法如下：
bindChangeCate: function (e) {
let index = e.detail.value;
let text = this.data.categoryList[index].name;
if (text == '全部') {
text = '职位类型'
}
this.setData({
cate_index: e.detail.value,
showCategory: text + '⏷',
categoryid: this.data.categoryList[index].id
});
//查询事件写在此处
},
标签：picker,index,示例,微信,value,text,id From： https://www.cnblogs.com/jizhong/p/16709988.html