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Copy code The code is as follows:

If multiple keyboard listening events are registered, even if the keyCode value is modified in the code segment, other keyboard listening events will still obtain the original keyCode. This is related to the JavaScript event model (remember to start from each registered listening event and propagate the event along its own route).
The following is the test code:

<!-- 这里测试jQuery的键盘响应是否正常 --> <!-- 这是回车转换行的代码段--> <input type="text" onkeydown="debug(event);"> <input type="text"> <input type="text"> <input type="text"> <input type="button" value="Button"> <span id="info"> </span>
Key code:

[Ctrl A select all Note: <script> $(function(){ $(document).keydown(function(evt){ debug(evt); }); }); </script>If you need to introduce external Js, you need to refresh to execute ]<script> function debug(evt){ document.getElementById('info').innerText=evt.keyCode||evt.charCode; } </script>