浏览器因为安全原因,默认不允许js代码跨域请求.如果要跨域只能用jsonp.
还可以通过配置web.config文件添加自定义头部来实现允许跨域请求.
如下,在system.webServer标签下添加:
<system.webServer>
<httpProtocol>
<customHeaders>
<add name="Access-Control-Allow-Origin" value="*" />
<add name="Access-Control-Allow-Headers" value="*" />
<add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE" />
</customHeaders>
</httpProtocol>
</system.webServer>