<body>
<div class="alert-box" id="alert">
알림창임
<button onclick="알림창열기('none')">닫기</button>
</div>
<button onclick="알림창열기('block')">버튼</button>
</body>
<style>
.alert-box{
background-color: blue;
padding: 20px;
margin: 10px;
width: 500px;
height: 100px;
font-weight: bold;
color: aliceblue;
line-height: 100px;
text-align: center;
border-radius: 5px;
display: none;
}
</style>
<script>
function 알림창열기(파라미터) {
document.getElementById('alert').style.display = 파라미터
}
function plus(파라미터1) {
2+ 파라미터1
}
plus(1);
plus(2);
plus(3);
/* function 알림창열기() {
document.getElementById('alert').style.display = 'block'
}
function 알림창닫기() {
document.getElementById('alert').style.display = 'none'
} */
</script>
