JS判定按键按键

//按键判定;
<script type="text/javascript">
 function keyValue(myEvent){
  if (document.all)myEvent=event;
  version=navigator.appVersion;
  if (version.indexOf("MSIE")==1){  if(myEvent.which==37){alert("你按下的按键代码值为：向左")};if(myEvent.which==39){alert("你按下的按键代码值为：向右")}}
  else{if(myEvent.keyCode==37){alert("你按下的按键值为：向左")};if(myEvent.keyCode==39){alert("你按下的按键值为：向右")}
   
  }
 }
 document.onkeydown=keyValue;
</script>