WeChatLittleAPP
2018.10.25 更新
有人反映弹出选择器控件时，不滑动直接点击“确定”按钮没有值返回显示。其实默认坐标是[0,0,0]的，只是没有更新数据而已。现已更正。
2017.07.21 17:30 更新
之前版本是从头写到尾没有封装的，有的同学可能看的一脸懵逼，昨天我用微信官方提供的WXML模板（template）对代码进行了封装，在模板中定义代码片段，通过封装以后我们就可以在不同的地方调用了。
有个不足。点击选择城市，弹出 picker-view，picker-view 显示的是 北京市 市辖区 东城区，如果此时点击右上角的确定，是没有执行赋值操作的，这样好像不合理吧？
希望大佬能够补全
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