Warning: mysqli_connect(): Access denied for user 'root'@'localhost' (using password: NO)的解決方法

我使用的是wampserver集成環境，用php測試連接mysql數據庫，使用mysqli_connect()，最後警告：Warning: mysqli_connect(): (HY000/1045): Access denied for user ‘root’@‘localhost’ (using password: NO) in E:\PHP\wampserver\wamp64\www\pro

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