Request header field Content-Type is not allowed by Access-Control-Allow-Headers跨域
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跨域错误提示：
XMLHttpRequest cannot load http://xxx.com. Request header field Content-Type is not allowed by Access-Control-Allow-Headers.
解决方案：
例如php服务端程序设置头：
header('Access-Control-Allow-Origin: *');header("Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept");header('Access-Control-Allow-Methods: GET, POST, PUT,DELETE');主要是这三个:
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