[千斤顶之一日一类003]Top Level: Boolean学习

Categories: Flex; Tagged with: ActionScript • Boolean • Flex; @ November 4th, 2008 0:09

昨天没有玩千斤顶, 今天也玩不动, 发现今天轮到Boolean了, 比较简单, 咬牙再坚持一下….

Boolean这个类的确很简单. Boolean用于存储逻辑判断的对象, 要么为true, 要么为False.

新建一个Boolean:

可以使用构造函数, 全局函数, 直接赋值.来实现. 如:
var flag:Boolean = true;
var flag:Boolean = new Boolean(true);
var flag:Boolean = Boolean(true);

Constructor Detail

使用给定的参数建立一个Boolean,  如果参数为空, 则该对象被初始化为False. 如果含有参数, 则该方法将按照Boolean()方法的规则将该参数转化并返回一个Boolean. Boolean()函数的转换规则如下:

Input Value	Example	Return Value
0	Boolean(0)	false
NaN	Boolean(NaN)	false
Number (not 0 or NaN)	Boolean(4)	true
Empty string	Boolean("")	false
Non-empty string	Boolean("6")	true
null	Boolean(null)	false
undefined	Boolean(undefined)	false
Instance of Object class	Boolean(new Object())	true
No argument	Boolean()	false

---

ActionScript Adobe AIR ANT Apache ApacheFlex Apache Flex Better Developer BlazeDS Cloud Computing CMD DataGrid DataGridColumn DB2 Derby DTSX Eclipse ETL Event Excel Flash Builder Flex Google Java JDBC JDK JIRA Life@SG|新加坡 Linux MySQL Oracle PHP Python RegEx Servlet SQL SQL Server SSIS SVN T-SQL Tools Tree Ugly WordPress XML dev-notes side-projects