在路由中启用CROSS，说对整个API项目有效...
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://localhost:9001/api/size/get. (Reason: CORS header 'Access-Control-Allow-Origin' missing).
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Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://localhost:9001/api/size/get. (Reason: CORS header 'Access-Control-Allow-Origin' missing).
static void EnableCrossSiteRequests(HttpConfiguration config)
{
var cors = new EnableCorsAttribute(
origins: "*",
headers: "*",
methods: "*"
);
config.EnableCors(cors);
}
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