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JS Learning Note----keyboard events

Source: Internet
Author: User
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There are 2 key keyboard events: onkeydown : triggered when the keyboard is pressed, if not lifted, it will be triggered continuously. onkeyup: When the keyboard bounces, not all elements can receive keyboard events, only elements that respond to user input, in other words, elements that receive focus can receive keyboard events.

Event.keycode : numeric type, which returns the ASCII code of the keyboard key. Ctrlkey, Shiftkey, Altkey: Boolean value. When an event occurs, if the ctrl| | Shift | | ALT is the pressed state, which returns true. Example code: 
1 <!DOCTYPE HTML>2 <HTMLLang= "en">3     <Head>4         <title>Keyboard events</title>5         <MetaCharSet= "UTF-8">6         <Metaname= "Viewport"content= "Width=device-width, initial-scale=1">7         <Script>8 window.onload= function(){9 Document.onkeydown= function(EV) {Ten                     varEV=EV||event; One                     //alert (Ev.keycode); Returns the ASCII code of the keyboard A                 } -  - Document.onclick= function(EV) { the                     varEV=EV||event; - alert (ev.ctrlkey);//returns False when clicked, and returns True when the CTRL key is pressed and then clicked -                 } -             }                   +         </Script> -     </Head> +     <Body> A         <Div> at              -         </Div> -     </Body> - </HTML>

JS Learning Note----keyboard events

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