What you are doing: Match against the first entry; If it doesn't match, show the message to the user and abort. What you wanted to do:. ... <看更多>

NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.startsWith(java.lang.String)' on a null object reference at ... ... <看更多>

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Summary: in this tutorial, you will learn how to use the JavaScript String startsWith() method to check if a string begins with the characters of another ... ... <看更多>