How to use jquery to determine which key to hit on the keyboard

Sometimes we need to determine which key we hit on the keyboard, which needs to query what the value of the key on the keyboard is, such as the ENTER key is 13.

Here's the jquery code, don't forget to refer to jquery package ha.

<script type= "Text/javascript" >
$ (document). KeyPress (function (event) {
var keycode = (event.keycode? event.keyCode:event.which);
alert (Event.which); Determine the value of the knock key
if (keycode = = ' 13 ') {//whether hit enter
$ ("#btn_login"). Click ();
}
});
</script>

When I hit the ENTER key, I can invoke the Click event with the ID btn_login button.

How to use jquery to determine which key to hit on the keyboard