uniapp-省市区三级联动
插件地址：https://ext.dcloud.net.cn/plugin?id=1301
报错：
Avoid using non-primitive value as key, use string/number value instead. 09:39:45.540 found in
解决：
v-for循环里，key值重复

报错：Duplicate keys detected: '[object Object]'. This may cause an update error.
09:41:20.954 found in
解决：还是键值的问题，检测到重复的键值

修改插件中的代码：
v-for="(item,index) in cityData" :key="index"