Request header field x-token is not allowed by Access-Control-Allow-Headers in preflight response.

問題：最近在做項目時，報錯Request header field x-token is not allowed by Access-Control-Allow-Headers in preflight response，剛開始看到‘Access-Control-Allow-Headers’就覺得是跨域問題，跟後臺聯調才發現問題； 剛開始接口跨域是後臺幫忙處理的，登錄接口因爲不需要傳token，所

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