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<!DOCTYPE html> <html> <body> <p>此示例使用 HTML DOM 将“onkeydown”事件分配给输入元素。</p> <p>按文本字段内的一个键以设置红色背景色。</p> <input type="text" id="demo"> <script> document.getElementById("demo").onkeydown = function() {myFunction()}; function myFunction() { document.getElementById("demo").style.backgroundColor = "red"; } </script> </body> </html>