解決跨域問題:No 'Access-Control-Allow-Origin' header is present on the requested resource.

PS:若是遇到 這個問題 Request header field Content-Type is not allowed by Access-Control-Allow-Headers,解決方法見另外一博文:解決:Request header field Content-Type is not allowed by Access-Control-Allow-Headershtml   1. 場景
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