No 'Access-Control-Allow-Origin' header is present on the requested resource:前後端的跨域問題
比如：前端127.0.0.1:8888，後端127.0.0.1:8081 前端和後端因爲來自不同的網域，所以在http的安全協議策略下，不信任 解決方案，在springmvc的控制層即controller中加入@CrossOrigin跨域訪問的註解
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