IT Study/Web

[JavaScript] 응용 예제 - 생일 D-day

도뿌리 2018. 8. 6. 14:42
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>다음생일까지 남은 일수</h1>
 
<pre>
다음 버튼을 클릭하여 생일을 입력하면,
다음 생일까지 남은 일수를 볼 수 있습니다.
</pre>
<button type="button" onclick="restDate()">생일은 입력</button>
 
<h3 id="result"></h3>
<script type="text/javascript">
function restDate() {
    var inputBirth = prompt('생일 입력(00-00)','');
    
    if(inputBirth.charAt(2) != '-' || inputBirth.length != 5 )
        alert("잘못입력 하셨습니다.");
    else{
        
        var today = new Date();
        
        //0 번째 월, 1 번째 일
        var arr = inputBirth.split("-");
        arr[0] = parseInt(arr[0]);
        arr[1] = parseInt(arr[1]);
        
        var nowMonth = today.getMonth()+1;
        var nowDate = today.getDate();
        
        if(nowMonth > arr[0]){    //월이 지났을때
            var nextBirth = new Date(today.getFullYear()+1,arr[0]-1,arr[1]);    //올해 날짜를 date obj로 생성
            var betweenDay = Math.ceil((nextBirth.getTime() - today.getTime()) /1000/60/60/24); 
            
            document.getElementById("result").innerHTML = "D-" + betweenDay;
        }else if(nowMonth == arr[0] && nowDate> arr[1]){//월은 같지만 일수가 지났을 때
            var nextBirth = new Date(today.getFullYear()+1,arr[0]-1,arr[1]);    //올해 날짜를 date obj로 생성
            var betweenDay = Math.ceil((nextBirth.getTime() - today.getTime()) /1000/60/60/24); 
            
            document.getElementById("result").innerHTML = "D-" + betweenDay;
        }else{
            var nextBirth = new Date(today.getFullYear(),arr[0]-1,arr[1]);    //올해 날짜를 date obj로 생성
            var betweenDay = Math.ceil((nextBirth.getTime() - today.getTime()) /1000/60/60/24); 
            
            document.getElementById("result").innerHTML = "D-" + betweenDay;
        }
    }
}
</script>
</body>
</html>
cs


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