IIS跨域配置
打开网站的标头设置，点击右上角添加，输入如下key和value值：
key:Access-Control-Allow-Headers
value:Content-Type,Token
value:Content-Type,Token
key:Access-Control-Allow-Origin
value:*
key:Access-Control-Expose-Headers
value:Token
重新启动即可
key:Access-Control-Allow-Origin
value:*
key:Access-Control-Expose-Headers
value:Token