HTML DOM KeyboardEvent altKey 属性
HTML DOM KeyboardEvent altKey 属性返回当 HTML 文档中触发键盘事件时是否按下了 ALT 键。
语法
以下是语法−
event.altKey
让我们来看一个 HTML KeyboardEvent altKey 属性的示例−
示例
<!DOCTYPE html> <html> <style> body { color: #000; height: 100vh; background: linear-gradient(62deg, #FBAB7E 0%, #F7CE68 100%) no-repeat; text-align: center; } input { border: 2px solid #fff; padding: 8px; background: transparent; width: 310px; border-radius: 20px; outline: none; } ::placeholder { color: #000; } .show { font-size: 1.2rem; color: #fff; } </style> <body> <h1>HTML KeyboardEvent altKey Property Demo</h1> <input type="text" placeholder="Enter your message" onkeydown="display(event)"> <div class="show"> </div> <script> function display(event) { if (event.altKey) { document.querySelector(".show").innerHTML = "The key is " + event.key + " key"; } else { document.querySelector(".show").innerHTML = "The key is " + event.key + " key"; } } </script> </body> </html>
输出
现在,开始在文本框中按任何键,然后观察按 ALT 键时 altKey 属性如何工作−
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