html运行实例（event_key_keycode

代码示例：（标识：event_key_keycode_4）

<!DOCTYPE html>
<html>
<body>

<p>在输入字段中按键盘上的某个键可获取被按下键的数字和字符。</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>