Handle the Enter key: Instead of having an Add button, watch for users pressing the Enter or Return key by hooking onto the onkeydown event in the textarea.
处理enter键：取消Add按钮，通过检查textarea的onkeydown事件看看用户是否按下了Enter或return键。
Once you find it, click the 're-enter the product key' option, if you want to return to the previous page and re-enter your product key.
一旦找到产品密钥，如果希望返回上一屏幕重新输入产品密钥，请单击“重新输入产品密钥”选项。
Once you find it, click the 're-enter the product key' option, if you want to return to the previous page and re-enter your product key.
一旦找到产品密钥，如果希望返回上一屏幕重新输入产品密钥，请单击“重新输入产品密钥”选项。
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