province[北京市", "天津市", "河北省", "山西省", "内蒙古自治区", "辽宁省", "吉林省", "黑龙江省", "上海市", "江苏省", "浙江省", "安徽省", "福建省", "江西省", "山东省", "河南省", "湖北省", "湖南省", "广东省", "广西壮族自治区", "海南省", "重庆市", "四川省",]
这个数组我在使用wx:for的时候，wx:key等于什么？
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相关文档
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wx:key='index'
老铁，文档都有的
https://developers.weixin.qq.com/miniprogram/dev/reference/wxml/list.html#wx:key