​x
 
<!DOCTYPE html>
<html>
<body>
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<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>
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<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>
​