ajax请求jsonp出错问题参考:https://blog.youkuaiyun.com/qq_15260769/article/details/80701647
sonp跨域+ashx(示例):https://www.cnblogs.com/xishuai/p/3552919.html
跨域解决方案二:使用JSONP实现跨域:https://www.cnblogs.com/choon/p/5393682.html
ashx文件获取$.ajax()方法发送的数据:https://www.cnblogs.com/xdp-gacl/p/3462349.html
map:https://blog.youkuaiyun.com/qq_22642239/article/details/76014591