<html><body><p>在输入字段中按下键盘上的一个键，以获取按下的键的数字和字符。</p><input type="text" size="40" onkeypress="myFunction(event)"><p id="demo"></p><script>function myFunction(event) { var x = event.keyCode; // 获取 Unicode 值 var y = String.fromCharCode(x); // 将值转换为字符 document.getElementById("demo").innerHTML = "Number: " + x + " = Character: " + y;}</script></body></html>