asp.net跨域问题

web.config中的“system.webServer”标签页中添加

<httpProtocol>
    <customHeaders>
        <add name="Access-Control-Allow-Origin" value="*" />
        <add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
        <add name="Access-Control-Allow-Headers" value="*" />
        <add name="Access-Control-Request-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
    </customHeaders>
</httpProtocol>