Time,Date

time api
<br />change #可以直接改時間ㄟ<br />last_month<br />next_week<br />seconds_since_midnight #從凌晨到現在的秒數<br />advance #等同since<br />days_in_month #秀哪個月幾天<br />#String 有<br />to_time, to_date <br />

default,time,format

Set the default date format for your Rails application
修改 Ruby 預設的 Time 顯示格式
<br />#加在environment.rb<br />ActiveSupport::CoreExtensions::Time::Conversions::DATE_FORMATS.merge!(<br /> :default => '%Y年%m月%d日',<br /> :date_time12 => "%m/%d/%Y %I:%M%p",<br /> :date_time24 => "%m/%d/%Y %H:%M"<br />)<br />

time range conditions

Record.find(:all, :conditions => {:todo_time => Time.now.ago(10.days)..Time.now})

Time db

Time#to_s(:db) ignores Time#zone -- example:

>> Time.mktime(2008, 06, 20, 0, 31, 7).to_s(:db)
=> "2008-06-20 00:31:07"
>> Time.utc(2008, 06, 20, 0, 31, 7).to_s(:db)
=> "2008-06-20 00:31:07"

Time, 想把秒數直接弄成幾天幾分幾秒

#at 從1970年1月1日後 幾秒鐘的時間
#at 直接拿到的是local time, 還要用getgm換成gmtime 就可以了
>> Time.at(10000).getgm
=> Thu Jan 01 02:46:40 UTC 1970


>> Time.gm(2000)
=> Sat Jan 01 00:00:00 UTC 2000
>> Time.mktime(2000)
=> Sat Jan 01 00:00:00 +0800 2000
>> Time.mktime(2000).getgm
=> Fri Dec 31 16:00:00 UTC 1999

string, to_time, parse

想把字串變成time object

>> ('2004/01/2').to_time
=> Fri Jan 02 00:00:00 UTC 2004 <<= 有UTC

>> Time.parse('2004/01/2')
=> Fri Jan 02 00:00:00 +0800 2004

time, setTimeout, setInterval, fadeOut, callback, 跑馬燈

1. 自己用setTimeout 做interval 比較好, 爆掉一次就讓他爆掉, 別用setInterval錯了還一直跑,利用 setTimeout 自己call 自己
2. fadeOut後, 才做替換html的hide動作, 需要將他放到callback 裡, 不然html hide和fadeOut是同步的這樣會直接看到消失而已
3. 可以將跑馬燈需要的option 藏起來, 像這樣藏在hidden_forum裡, 用size()可以知道裡面包含幾個
   

<div id='hidden_forum' style='display:none'>
<div>abc</div>
<div>def</div>
</div>

<script type="text/javascript">
var index = 0;
var shuffler;
var news;
var max_news;

function replace_news(){
index =  index % max_news
news = $('#hidden_forum div:eq('+index+')').clone();
shuffler.fadeOut('slow', function() {shuffler.html(news.html()).hide().fadeIn('slow') });
index++;
if(max_news > 1) { var dummy = setTimeout(replace_news, 5000); }
}

$(function(){
 max_news = $('#hidden_forum div').size();

if(max_news > 0){
  shuffler = $('div.news div');
  replace_news();
}
});
</script>