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JavaScript

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HTML DOM

DOM Attributes DOM Document DOM Element DOM Events DOM Event 对象 DOM HTMLCollection DOM Location DOM Navigator DOM Screen DOM Style
alignContent alignItems alignSelf animation animationDelay animationDirection animationDuration animationFillMode animationIterationCount animationName animationTimingFunction animationPlayState background backgroundAttachment backgroundColor backgroundImage backgroundPosition backgroundRepeat backgroundClip backgroundOrigin backgroundSize backfaceVisibility border borderBottom borderBottomColor borderBottomLeftRadius borderBottomRightRadius borderBottomStyle borderBottomWidth borderCollapse borderColor borderImage borderImageOutset borderImageRepeat borderImageSlice borderImageSource borderImageWidth borderLeft borderLeftColor borderLeftStyle borderLeftWidth borderRadius borderRight borderRightColor borderRightStyle borderRightWidth borderSpacing borderStyle borderTop borderTopColor borderTopLeftRadius borderTopRightRadius borderTopStyle borderTopWidth borderWidth bottom boxShadow boxSizing captionSide caretColor clear clip color columnCount columnFill columnGap columnRule columnRuleColor columnRuleStyle columnRuleWidth columns columnSpan columnWidth counterIncrement counterReset cursor direction display emptyCells filter flex flexBasis flexDirection flexFlow flexGrow flexShrink flexWrap cssFloat font fontFamily fontSize fontStyle fontVariant fontWeight fontSizeAdjust height isolation justifyContent left letterSpacing lineHeight listStyle listStyleImage listStylePosition listStyleType margin marginBottom marginLeft marginRight marginTop maxHeight maxWidth minHeight minWidth objectFit objectPosition opacity order orphans outline outlineColor outlineOffset outlineStyle outlineWidth overflow overflowX overflowY padding paddingBottom paddingLeft paddingRight paddingTop pageBreakAfter pageBreakBefore pageBreakInside perspective perspectiveOrigin position quotes resize right scrollBehavior tableLayout tabSize textAlign textAlignLast textDecoration textDecorationColor textDecorationLine textDecorationStyle textIndent textOverflow textShadow textTransform top transform transformOrigin transformStyle transition transitionProperty transitionDuration transitionTimingFunction transitionDelay unicodeBidi userSelect verticalAlign visibility width wordBreak wordSpacing wordWrap widows zIndex
DOM Window

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HTML 对象

<a> <abbr> <address> <area> <article> <aside> <audio> <b> <base> <bdo> <blockquote> <body> <br> <button> <canvas> <caption> <cite> <code> <col> <colgroup> <datalist> <dd> <del> <details> <dfn> <dialog> <div> <dl> <dt> <em> <embed> <fieldset> <figcaption> <figure> <footer> <form> <head> <header> <h1> - <h6> <hr> <html> <i> <iframe> <img> <ins> <input> button <input> checkbox <input> color <input> date <input> datetime <input> datetime-local <input> email <input> file <input> hidden <input> image <input> month <input> number <input> password <input> radio <input> range <input> reset <input> search <input> submit <input> text <input> time <input> url <input> week <kbd> <label> <legend> <li> <link> <map> <mark> <menu> <menuitem> <meta> <meter> <nav> <object> <ol> <optgroup> <option> <output> <p> <param> <pre> <progress> <q> <s> <samp> <script> <section> <select> <small> <source> <span> <strong> <style> <sub> <summary> <sup> <table> <tbody> <td> <tfoot> <th> <thead> <tr> <textarea> <time> <title> <track> <u> <ul> <var> <video>

其他参考手册

CSSStyleDeclaration JS 类型转换


KeyboardEvent key 属性

❮ DOM 事件 ❮ KeyboardEvent

实例

获取发生按键事件时按下的键盘按钮:

var x = event.key;
亲自试一试 »

页面下方有更多实例。


定义和用法

key 属性返回发生按键事件时按下的键的标识符。

按键标识符是标识键盘按钮的字符串。此属性的返回值可以是以下字符串:

  • 单个字符(比如 "a", "W", "4", "+" 或 "$")
  • 多字符(比如 "F1", "Enter", "HOME" 或 "CAPS LOCK")

注释:该属性是只读的。

提示:如果您想知道在发生按键事件时是否按下了 "ALT"、"CTRL"、"META" 或 "SHIFT" 键,请使用 altKeyctrlKeymetaKeyshiftKey 属性。


浏览器支持

表中的数字表示支持该属性的第一个浏览器版本。

属性
key 51.0 9.0 23.0 10.0 38.0


语法

event.key

技术细节

返回值:

字符串,代表按下的键盘按钮。

可能的值:

  • 单个字符(比如 "a", "W", "4", "+" 或 "$")
  • 多字符(比如 "F1", "Enter", "HOME" 或 "CAPS LOCK")

注释:在 Safari 中返回未定义。

DOM 版本: DOM Level 3 Events

更多实例

实例

如果用户按下 "A" 键,则提示一些文本:

var x = event.key;

// 如果按下的键盘按钮是 "a" 或 "A"(使用 caps lock 或 shift),则提示一些文本。

if (x == "a" || x == "A") {
  alert ("You pressed the 'A' key!");
}
亲自试一试 »

相关页面

HTML DOM 参考手册: KeyboardEvent keyCode 属性

HTML DOM 参考手册: KeyboardEvent which 属性

HTML DOM 参考手册: KeyboardEvent charCode 属性


❮ DOM 事件 ❮ KeyboardEvent