$(엘리먼트) 와 jQuery(엘리먼트)는 같은것 을 의미
$(엘리먼트) == jQuery(엘리먼트)
$() == jQuery()
ex)
<button id="inputButton" type="button">등록</button>
$("#inputButton")
ex)
<button class="updateButton" type="button">수정</button>
$(".updateButton")
ex)
<input type="submit" name="deleteButton">삭제</button>
$("input[name=deleteButton]")
<input type="hidden" id="test_id" class="test_class" name="test_name" value="test">
var value = $('#test_id').val();
var value = $('.test_class').val();
var value = $('input[name=test_name]').val();
참고 https://breakpoint.tistory.com/85, https://specupup.tistory.com/6, https://codethief.io/ko/get-input-value-by-id-class-and-name-using-jquery/