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XMLHttpRequest cannot load http://imoocnote.calfnote.com/inter/getClasses.php?curPage=1. Request header field X-Requested-With is not allowed by Access-Control-Allow-Headers in preflight response. 控制台会报错原因？
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XMLHttpRequest cannot load http://imoocnote.calfnote.com/inter/getClasses.php?curPage=1. Request header field X-Requested-With is not allowed by Access-Control-Allow-Headers in preflight response. 控制台会报错原因？
2017-07-28
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