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JavaScript 日付計算

Posted at

js.png

##JavaScript勉強メモ。
4点を意識して写経なり
- 動くアプリを作る
- 書いたコードを理解
- 機能またはデザインを追加
- 成果物は、ネット上にあげる

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>日付計算</title>
</head>
<body>
    <h1>日付計算の練習</h1>
    <p>誕生日<input type="text" id="birthday" value="1984-12-05"></p>
    <p><input type="button" value="計算!" onclick="getAge()";></p>
    <p>生まれてから<span id="dayPast">???</span>日経過していて、だいたい<span id = age>???</span>です。</p>
    
    <script>
        function getAge(){
            //入力値の取得
            var birthday = document.getElementById("birthday").value.split("-");;
            
            //日付オブジェクトの作成(配列に値を入れる)
            var d1 = new Date(birthday[0], birthday[1]-1, birthday[2]);
            var d2 = new Date();
            
            //日数、年齢の計算(日付:現在から生まれた年を引く)
            var diff = d2.getTime() - d1.getTime();
            var dayPast = Math.floor(diff/(1000*60*60*24));
            var age = Math.floor(dayPast / 365.25);
            
            //結果の表示
            document.getElementById("dayPast").innerHTML = dayPast;
            document.getElementById("age").innerHTML = age;        
        }
    </script>

</body>
</html>
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