css3 text-shadow

text-shadow 係css3 的standard
唔駛加browser prefix 都用到 =]
支援的browser: firefox, chrome, safari, opera [no ie =.=]

.text_shadow{

    text-shadow: 5px -10px 20px #ff0000;

}

第1個 (5px): x 的偏離, 正數係右面, 負數係左面
第2個 (-10px): y 的偏離, 正數係下面, 負數係上面
第3個 (20px): blur 的長度 (越大越濛)
第4個 (#ff0000): 顏色

 可以有幾個shadow 的, 用 ',' 分隔

.text_shadow 的效果

js change obj to param string

js 用會 {id:12, name:'user'} 來做data,

點可以好快咁變成 id=12&name=user 呢?

ajax call 時好好用的~!

var params = {id:12, name:'user'};

jquery:

http://api.jquery.com/jQuery.param/

$.param(params);

PS: space 會變做+

prototype:

http://api.prototypejs.org/language/Object/toQueryString/

Object.toQueryString(params);

PS: space 會變做%20

sql get all child cat by parent id

改少少就可以拎哂所有child
平時冇咩用, 但searching 好有用 =]

SELECT t1.* FROM category AS t1

LEFT JOIN category AS t2 ON t2.category_id= t1.parent

LEFT JOIN category AS t3 ON t3.category_id =t2.parent

WHERE 

(t1.category_id = [child_id] OR t2.category_id = [child_id] OR t3.category_id = [child_id])

 ORDER BY t1.LEVEL

js trim

how to trim a string using js?

function trim(str){

 return str.replace(/^\s\s*/, '').replace(/\s\s*$/, '');

}

function trim(str){

 return str.replace(/^\s+|\s+$/g, '');

}

str = trim(str);

jquery:

http://api.jquery.com/jQuery.trim/

str = $.trim(str);

prototype:
http://api.prototypejs.org/language/String/prototype/strip/

str =  str.strip();