unicode码

<script>
  function myFun(e) {
    var e = e || event
    var x = e.keyCode
    //  var x = e.which
    if(x) {
      alert('按键的Unicode码为：' + x)
    }
  }
  //document.onkeydown = myFun
  document.onkeypress = myFun
</script>