7.1与PTB兼容的按键相关命令 ·新建一个m文件KbPractice ·功能：持续记录键盘上的按键，并在命令窗口显示对应的 按键数字码以及按键时间；按SPACE键结束记录。 1 号bPractice,m 2 Displays the number of seconds that have elapsed when the user presses a key. sa simplified version of KbDemo modified by YW,2022 >KbPractice %在命令窗口运行KbPractice Testing KbCheck and KbName:press a key to see its number Press the 'SPACE'key to exit. You pressed key 87 which is w typed at time 2.4043seconds You pressed key 69 which is e typed at time 3.5383seconds You pressed key 65 which is a typed at time 5.286seconds You pressed key 82 which is r typed at time 5.7581seconds You pressed key 70 which is f typed at time 6.828seconds You pressed key 49 which is 1!typed at time 12.7795seconds You pressed key 50 which is 23 typed at time 13.3814seconds You pressed key 51 which is 3 typed at time 13.8795seconds You pressed key 97 which is 1 typed at time 15.4673seconds You pressed key 98 which is 2 typed at time 15.7394seconds You pressed key 99 which is 3 typed at time 16.1774seconds You pressed key 32 which is space typed at time 18.0832secondsl 新建一个m文件KbPractice • 功能：持续记录键盘上的按键，并在命令窗口显示对应的 按键数字码以及按键时间；按SPACE键结束记录。 %在命令窗口运行KbPractice