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<!DOCTYPE html>
<html>
<body>
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<p>在输入栏中按键盘上的任意键可以得到 Unicode 字符代码和被按下键的 Unicode 键盘代码。</p>
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<p><b>注释：</b>which 和 keyCode 属性对不可打印的功能键（如 CAPS LOCK、CTRL、ESC、F12 等）的 onkeypress 事件都不起作用。</p>
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<input type="text" size="50" onkeypress="uniCharCode(event)" onkeydown="uniKeyCode(event)"> 
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<p>onkeypress - <span id="demo"></span></p>
<p>onkeydown - <span id="demo2"></span></p>
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<script>
function uniCharCode(event) { 
  var char = event.which || event.keyCode; 
  document.getElementById("demo").innerHTML = "The Unicode CHARACTER code is: " + char;
}
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function uniKeyCode(event) {
  var key = event.which || event.keyCode; 
  document.getElementById("demo2").innerHTML = "The Unicode KEY code is: " + key;
}
</script>
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</body>
</html>
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