체크박스 전체 버튼 눌렀을 때 다른 체크 해제 하기

		<ul class="" style="">
			<li>
				<input type="checkbox" name="inAll" 
                onclick='checkSelectAll(event)' value="inAll" id="1">
				<label for="1">전체</label>
			</li>
			<li>
			<input type="checkbox" name="in[]" class="in" 
            onclick='selectAll1(this)' value="1" id="2">
			<label for="2">1</label>
			</li>
			<li>
				<input type="checkbox" name="in[]" class="in"
                onclick='selectAll1(this)' value="2" id="3">
				<label for="3">2</label>
			</li>
			<li>
				<input type="checkbox" name="in[]" class="in" 
                onclick='selectAll1(this)' value="3" id="4">
				<label for="4">3</label>
			</li>
			<li>
				<input type="checkbox" name="in[]" class="in" 
                onclick='selectAll1(this)' value="4" id="5">
				<label for="5">4</label>
			</li>
		</ul>

   // .in은 class 를 써주기
   function checkSelectAll(e)  {
		if(e.target.checked) {
			document.querySelectorAll(".in").forEach(function(v, i) {
				v.checked = false;
			});
		} else {
			document.querySelectorAll(".in").forEach(function(v, i) {
				v.checked = false;
			});
		}
	}
	function selectAll1(selectAll)  {
		let checkCount = 0;
		document.querySelectorAll(".in").forEach(function(v, i) {
			if(v.checked === false){
				checkCount++;
			}
		});
		if(checkCount>0) {
			document.getElementById("1").checked = false;
		} else if(checkCount === 0) {
			document.getElementById("1").checked = true;
            document.querySelectorAll("." + classname).forEach(function(v, i) {
				v.checked = false;
			});
		}
	}