事件名称 说明

onkeypress 这个事件在用户按下并放开任何字母数字键时发生。系统按钮（例如，箭头键和功能键）无法得到识别。



onkeyup 这个事件在用户放开任何先前按下的键盘键时发生。



onkeydown 这个事件在用户按下任何键盘键（包括系统按钮，如箭头键和功能键）时发生。 -Onkeypress event name that this event in the user press and release occurs when any alphanumeric key. System buttons (for example, the arrow keys and function keys) can not be identified. onkeyup this event in the user of any previous release occurs when the keyboard key pressed. onkeydown the event the user presses any keyboard key (including the system buttons, such as the arrow keys and function keys) occurs.