任意のクラスを持つ input タグの値に今日の日付をセットする

set-value-to-today.js

(function(global) {
  function SetValueToToday(className) {
    var date = new Date(),
        year,
        month,
        day,
        today;

    this.className = className || 'set-value-to-today';
    this.className = this.className.replace(/^\./, '');

    year = date.getFullYear();
    month = date.getMonth() + 1;
    day = date.getDate();
    today = year + '/' + month + '/' + day;

    $('.' + this.className).val(today);
  }

  global.SetValueToToday = SetValueToToday;
}(this));