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The onkeydown event occurs when a keyboard key is pressed.
当按下一个键盘按键时触发onkeydown事件
onkeydown="所要执行的脚本" |
Parameter 参数 | Description 注释 |
---|---|
SomeJavaScriptCode 所要执行的脚本 | Required. Specifies a JavaScript to be executed when the event occurs. 必选项。当事件触发时所要执行的脚本 |
Supported by the following HTML tags:
所支持的HTML标签:
<a>, <acronym>, <address>, <area>, <b>, <bdo>, <big>, <blockquote>, <body>, <button>, <caption>, <cite>, <code>, <dd>, <del>, <dfn>, <div>, <dt>, <em>, <fieldset>, <form>, <h1> to <h6>, <hr>, <i>, <input>, <kbd>, <label>, <legend>, <li>, <map>, <object>, <ol>, <p>, <pre>, <q>, <samp>, <select>, <small>, <span>, <strong>, <sub>, <sup>, <table>, <tbody>, <td>, <textarea>, <tfoot>, <th>, <thead>, <tr>, <tt>, <ul>, <var> |
Supported by the following JavaScript objects:
所支持的JavaScript对象:
document, image, link, textarea |
Browser differences: Internet Explorer uses event.keyCode to retrieve the character that was pressed and Netscape/Firefox/Opera uses event.which.
不同浏览器:IE用event.keyCode来获取被按下的按键值,而NetScape/FireFox/Opera用的则是event.which
In this example the user cannot type numbers into the input field:
在下面的例子中,用户将无法向文本框内输入数字:
<html> if(window.event) // IE <form> </html> |
The output of the code above will be:
输出结果为:
onkeydown
How to use onkeydown.
如何应用onkeydown