简易时间戳

function formatDate(now)   {     
    var now = new Date(),
    y = now.getFullYear(),
    m = now.getMonth() + 1,
    d = now.getDate();
    return y + "." + (m < 10 ? "0" + m : m) + "." + (d < 10 ? "0" + d : d);    
  }

只有年月日