Result jQuery//現在の年数オブジェクトを4桁で生成 var time = new Date(); var year = time.getFullYear(); //1900年まで表示 for (var i = year; i >= 1900; i--) { $('#year').append('<option value="' + i + '">' + i + '</option>'); } //1~12の数字を生成 for (var i = 1; i <= 12; i++) { $('#month').append('<option value="' + i + '">' + i + '</option>'); } //1~31の数字を生成 for (var i = 1; i <= 31; i++) { $('#day').append('<option value="'
![select要素内に年月日などの数字を自動生成する](https://cdn-ak-scissors.b.st-hatena.com/image/square/b6b1c87ada2ad66409793e3653c810e333009609/height=288;version=1;width=512/http%3A%2F%2Fkachibito.net%2Fwp-content%2Fuploads%2F2019%2F12%2Fsite-icon.png)