Using jquery is really convenient. For example, if you want to control the display and hiding of divs, you can do it in one sentence. Please see the instructions below.
$("#id").show() means display:block,
$("#id").hide() means display:none;
$("#id").toggle() switches the visible state of the element. If the element is visible, switch it to hidden; if the element is hidden, switch it to visible.
$("#id").css('display','none');
$("#id").css('display','block');
or
$("#id")[0].style.display = 'none';
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