function onMenuClick() { if (menuShown) { // hideMenu(); document.getElementById('menu').style.display = 'none'; } else { // showMenu(); document.getElementById('menu').style.display = 'block'; } menuShown = !menuShown; }
<div id='menu'> <ul> <li>Menu option 1</li> <li>Menu option 2</li> <li>Menu option 3</li> </ul> </div>
var
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