JavaScript修改日期格式

<script>
  //封装时间格式
  function format(time, format) {
    var t = new Date(time);
    var tf = function (i) {
      return (i < 10 ? ‘0‘ : ‘‘) + i
    };
    return format.replace(/yyyy|MM|dd|HH|mm|ss/g, function (a) {
      switch (a) {
        case ‘yyyy‘:
          return tf(t.getFullYear());
          break;
        case ‘MM‘:
          return tf(t.getMonth() + 1);
          break;
        case ‘mm‘:
          return tf(t.getMinutes());
          break;
        case ‘dd‘:
          return tf(t.getDate());
          break;
        case ‘HH‘:
          return tf(t.getHours());
          break;
        case ‘ss‘:
          return tf(t.getSeconds());
          break;
      }
    })
  }
</script>