跨域Ajax请求 web.config文件配置

在web.config文件的<system.webServer>节点下面添加如下配置代码：
<!--允许跨域ajax访问-->
    <httpProtocol>
        <customHeaders>
            <add name="Access-Control-Allow-Origin" value="*" />
            <add name="Access-Control-Allow-Headers" value="Content-Type" />
            <add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
        </customHeaders>
    </httpProtocol>
<!--end-->