for a C++ program converts true and false to 1 and 0 where integer values are expected, and it converts 0 to false and nonzero to true where bool values are expected.

用構(gòu)造函數(shù)定義屬性，用原型定義方法
function ClassA(sColor) {
    this.color = sColor;
}

ClassA.prototype.sayColor = function () {
    alert(this.color);
};

function ClassB(sColor, sName) {
    ClassA.call(this, sColor);
    this.name = sName;
}

ClassB.prototype = new ClassA();

ClassB.prototype.sayName = function () {
    alert(this.name);
};
在此例子中，繼承機制由兩行突出顯示的藍色代碼實現(xiàn)。在第一行突出顯示的代碼中，在 ClassB 構(gòu)造函數(shù)中，用對象冒充繼承 ClassA 類的 sColor 屬性。在第二行突出顯示的代碼中，用原型鏈繼承 ClassA 類的方法。由于這種混合方式使用了原型鏈，所以 instanceof 運算符仍能正確運行。

下面的例子測試了這段代碼：
var objA = new ClassA("blue");
var objB = new ClassB("red", "John");
objA.sayColor(); //輸出 "blue"
objB.sayColor(); //輸出 "red"
objB.sayName(); //輸出 "John"

摘自http://www.w3school.com.cn/js/pro_js_inheritance_implementing.asp

做個查詢，字段1值除3，如果=1，就用字段2值-20，如果=2，字段2 值-30，將差值大于0的數(shù)據(jù)選出來?

SELECT col1, col2,?
CASE?
???WHEN col1 / 3 = 1 THEN col2 - 20?
???WHEN col1 / 3 = 2 THEN col2 - 30
END AS difference
FROM price
WHERE (
CASE?
???WHEN col1 / 3 = 1 THEN col2 - 20?
???WHEN col1 / 3 = 2 THEN col2 - 30
END > 0)

...

<%@ page isThreadSafe="true|false" %>
默認(rèn)值為true

isThreadSafe=false模式表示它是以Singleton模式運行。
???? 該模式implements了接口SingleThreadMode,
???? 該模式同一時刻只有一個實例，不會出現(xiàn)信息同步與否的概念。
???? 若多個用戶同時訪問一個這種模式的頁面，
???? 那么先訪問者完全執(zhí)行完該頁面后，后訪問者才開始執(zhí)行。

isThreadSafe=true模式表示它以多線程方式運行。
??? 該模式的信息同步，需訪問同步方法(用synchronized標(biāo)記的)來實現(xiàn)。
??? 一般格式如下：
??? public?synchronized void syncmethod(...){
??????if(...)?{
?????????wait();
??????}
??????notifyAll();
??? }

1. <iframe id=""?name=""width="0" height="0" src=""></iframe>
??????parent.window.location.reload();

2.? window.open( [sURL] [, sName] [, sFeatures] [, bReplace])
??????window.opener.location.reload();

3. window.showModalDialog(sURL [, vArguments] [, sFeatures])
??????vArguments 用 window表示，代表該window對象
??????window.dialogArguments.location.reload();

當(dāng)子類繼承了父類之后，之類初始化順序如下：

1.父類static變量，或程序塊
2.子類static變量，或程序塊
3.父類成員變量
4.父類構(gòu)造函數(shù)
5.子類成員變量
6.子類構(gòu)造函數(shù)

去年的今天我買了我的第一塊滑板，boiling 2005款。

oracle里面round為四舍五入，絕對值四舍五入后加符號

java里面的
Math.round(a): (long)Math.floor(a + 0.5d)
Math.floor(a): 不大于a的最大整數(shù)

--商品價格信息表
create table GOODS(
?ID NUMBER,
?NAME VARCHAR2(10),
?PRICE NUMBER(10,2),
?AREA VARCHAR2(10)
);
--添加主鍵
alter table GOODS
add constraint PK_GOODS primary key (ID);
--添加注視
comment on table GOODS? is '商品信息表';
comment on column GOODS.ID is '商品編號';
comment on column GOODS.NAME is '商品名稱';
comment on column GOODS.PRICE is '商品價格';
comment on column GOODS.AREA is '銷售地區(qū)';

--添加數(shù)據(jù)
insert into GOODS values(11,'蘋果','2.5','成都1');
insert into GOODS values(12,'蘋果','3.5','成都2');
insert into GOODS values(13,'蘋果','1.5','成都3');
insert into GOODS values(14,'蘋果','2.0','成都4');

insert into GOODS values(21,'香蕉','1.7','成都1');
insert into GOODS values(22,'香蕉','1.5','成都2');
insert into GOODS values(23,'香蕉','1.6','成都3');
insert into GOODS values(24,'香蕉','2.0','成都4');

--查詢某種商品平均價
select NAME,avg(PRICE) from GOODS group by NAME;

--將商品價格更新為同種商品（名稱相同）的平均價格
update GOODS A
set A.PRICE =
(
?select avg(PRICE) from GOODS where NAME = A.NAME
);

--執(zhí)行環(huán)境oracle

修改開機畫面和聲音：
進入\ HKEY_LOCAL_MACHINE\SOFTWARE\HTC\StartUpAnim
將 Audio 及 Video 的值都改成： *none*，如果沒有該鍵值，自己創(chuàng)建。
（原Audio值為：\Windows\startup-WAVE.WAV）
（原Video值為：\Windows\startup-GIF240.gif.mfb）

關(guān)機畫面及聲音：
進入\HKEY_CURRENT_USER\ControlPanel\Sounds\Shutdown
將Image、Sound及Wave的值都改成：*none*，如果沒有該鍵值，自己創(chuàng)建
（原 Image 值為：\Windows\shutdown.gif）
（原 Sound 值為：\Carrier_Boot.mid）
（原 Wave 值為：\Windows\shutdown.wav）

修改其他聲音：
進入\HKEY_CURRENT_USER\ControlPanel\Sounds\
進入相應(yīng)的聲音類別，修改Sound即可

struts學(xué)習(xí)筆記

添加表注釋
comment on table 表名 is '表注釋'
添加字段注釋
comment on column 表名.字段名 is '字段名注釋'

查詢表注釋
select * from user_tab_comments
查詢字段注釋
select * from user_col_comments

查詢以TAB_開頭的表的注釋
where table_name like 'TAB/_%' escape '/'
由于下劃線在數(shù)據(jù)庫中代表任意單個字符,所以需要轉(zhuǎn)義
單引號由單引號字符轉(zhuǎn)換

Hustle & Flow 川流熙攘
影片講述一個皮條客進軍嘻哈樂界的“傳奇”故事。
主角是一位夢想成為說唱樂手的黑人無業(yè)青年，為了實現(xiàn)自己的理想，他克服了許多艱難險阻，刻苦的練習(xí)說唱。

其中有首歌：It's hard out here for a pimp

[Chorus 2X: Shug - singing] + (Djay)
You know it's hard out here for a pimp (you ain't knowin)
When he tryin to get this money for the rent (you ain't knowin)
For the Cadillacs and gas money spent (you ain't knowin)
[1] Because a whole lot of bitches talkin shit (you ain't knowin)
[2] Will have a whole lot of bitches talkin shit (you ain't knowin)

[Djay]
In my eyes I done seen some crazy thangs in the streets
Gotta couple hoes workin on the changes for me
But I gotta keep my game tight like Kobe on game night
Like takin from a ho don't know no better, I know that ain't right
Done seen people killed, done seen people deal
Done seen people live in poverty with no meals
It's fucked up where I live, but that's just how it is
It might be new to you, but it's been like this for years
It's blood sweat and tears when it come down to this shit
I'm tryin to get rich 'fore I leave up out this bitch
I'm tryin to have thangs but it's hard fo' a pimp
But I'm prayin and I'm hopin to God I don't slip, yeah

[Chorus]

[Djay]
Man it seems like I'm duckin dodgin bullets everyday
Niggaz hatin on me cause I got, hoes on the tray
But I gotta stay paid, gotta stay above water
Couldn't keep up with my hoes, that's when shit got harder
North Memphis where I'm from, I'm 7th Street bound
Where niggaz all the time end up lost and never found
Man these girls think we prove thangs, leave a big head
They come hopin every night, they don't end up bein dead
Wait I got a snow bunny, and a black girl too
You pay the right price and they'll both do you
That's the way the game goes, gotta keep it strictly pimpin
Gotta have my hustle tight, makin change off these women, yeah

[Chorus]