How to use 'onkeydown jquery' in JavaScript

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13function keydown(evt){
14 if (evt.ctrlKey && evt.keyCode == 32){ //CTRL+ALT+F4
15 var search = document.getElementById('search');
16 search.className = 'open';
17 document.getElementById('searchInput').focus();
18 } else if (evt.keyCode == 27) {
19 var search = document.getElementById('search');
20 search.className = '';
21 document.getElementById('searchInput').blur();
22 }
23}

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