Compatibility testing of keyCode, which and charCode in keyboard events_Basic knowledge

Test results:
Under IE:
>> supports keyCode
>> does not support which and charCode, both values ​​are undefined

Under Firefox:
>> Supports keyCode. Except for function keys, other key values ​​are always 0
>> Supports which and charCode, the values ​​of which are the same

Under Opera:
> > Support keyCode and which, both have the same value
>> CharCode is not supported, the value is undefined

<p> </p>Please press any key to see the test effect: <span id="type"> type:</span><span id="currKey"> Current Key:</span><span id="Decimal"> Decimal:</span><span id="keyCode"> keyCode:</span><strong> </strong>Note: under FF, keyCode is always 0<span id="which"> which:</span><strong> </strong>Note: under IE, which is always undefined; under Opera, the values ​​of keyCode and charCode are the same<span id="charCode"> charCode:</span><strong> </strong>Note: Under IE and Opera, charCode is always undefined; under FF, the values ​​of which and charCode are the same<span id="caps"> Capital letters:</span><span id="altKey"> altKey:</span><span id="ctrlKey"> ctrlKey:</span><span id="shiftKey"> shiftKey:</span><span id="repeat"> repeat:</span><style type="text/css" media="all"> body {color:#999;font:normal 14px tahoma,宋体,Geneva,Arial,sans-serif;} span {color:#f00;font-weight:bold;padding:0 5px;} strong {color:#090;font-weight:normal;padding:0 5px;} </style>
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