### 返回值:Stringevent.which
### *V1.1.3*概述
針對鍵盤和鼠標事件，這個屬性能確定你到底按的是哪個鍵或按鈕。
event.which?將?event.keyCode?和?event.charCode?標準化了。推薦用?event.which?來監視鍵盤輸入。更多細節請參閱：?[event.charCode on the MDC](https://developer.mozilla.org/en/DOM/event.charCode#Notes).
### 示例
#### 描述:
記錄按鍵。
##### 代碼:
~~~
<!DOCTYPE html>
<html>
<head>
<script src="http://code.jquery.com/jquery-latest.min.js"></script>
</head>
<body>
<input id="whichkey" value="type something">
<div id="log"></div>
<script>
$('#whichkey').bind('keydown',function(e){
$('#log').html(e.type + ': ' + e.which ); });
</script>
</body>
</html>
~~~
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