运行程序后出来这一条，显示错误，这是什么错误
XMLHttpRequest cannot load http://www.imooc.com/data/info_f.php. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access.
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XMLHttpRequest cannot load http://www.imooc.com/data/info_f.php. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access.
2015-12-23
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