积少成多Flash(1) - ActionScript 3.0 基础之数据类型、操作符和流程控制语句

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积少成多Flash(1) - ActionScript 3.0 基础之数据类型、操作符和流程控制语句


作者:webabcd


介绍
Flash ActionScript 3.0 中所有的数据类型都是对象,操作符和流程控制语句的语法与C#类似


示例
Basic.as
// 包
package 
{
    
// 导入包
    import flash.display.Sprite;
    
    
// Basic类继承自Sprite
    // 包内只可以定义一个类
    // 类名必须与文件名相同
    public class Basic extends Sprite
    
{
        
// 构造函数
        public function Basic()
        
{
            trace(
"Hello ActionScript");
            
// output: Hello ActionScript
            
            
// 数据类型(一切都是对象)
            showDataType();
            
            
// 各个对象的默认值
            showDefaultValue();
            
            
// 操作符
            showOperator();
            
            
// 流程控制语句
            showFlowControl();
        }

        
        
// 数据类型(一切都是对象)
        function showDataType():void
        
{
            
// 声明常量
            const c:String = "CONST webabcd";
            trace(c);
            
// output: CONST webabcd
            
            
// 整型
            var i:int = -100;
            trace(i);
            
// output: -100
            
            
// 布尔值
            var b:Boolean = true;
            trace(b);
            
// output: true
            
            
// 数字类型(有小数的时候)
            var n:Number = 100.123;
            trace(n);
            
// output: 100.123
            
            
// 正整数
            var u:uint = 100;
            trace(u);
            
// output: 100
            
            
// 字符串
            var s:String = "webabcd";
            trace(s);
            
// output: webabcd
            
            
// 一维数组(赋初始值)
            var a:Array = new Array(1,2,3);
            trace(a[
0]);
            
// output: 1
            
            
// 一维数组(赋初始值)
            var a2:Array = [1,2,3];
            trace(a2[
1]);
            
// output: 2
            
            
// 一维数组(指定数组长度)
            var a3:Array = new Array(3);
            a3[
0= 1;
            a3[
1= 2;
            a3[
2= 3;
            trace(a3[
2]);3
            
// output: 
            
            
// 二维数组(赋初始值)
            var aa:Array = [[1,2,3], [4,5,6], [7,8,9]];
            trace(aa[
0][0]);
            
// output: 1
            
            
// 二维数组(指定数组长度)
            var aa2:Array = new Array(3);
            aa2[
0= [1,2,3];
            aa2[
1= [4,5,6];
            aa2[
2= [7,8,9];
            trace(aa2[
0][0]);
            
// output: 1
            
            
// 日期类型
            var d:Date = new Date();
            trace(d.toDateString());
            
// output: Mon Nov 12 2007
            
            
// 声明一个新对象
            // var o:Object = new Object();
            // var o:Object = {};
            
            
// 声明一个新对象,同时写入属性
            var o:Object = {nickname:"webabcd", age:"27"};
            
            
// 为对象动态地添加属性
            o["salary"= 1000;
            trace(o.nickname);
            
// output: webabcd
            
            trace(o.age);
            
// output: 27
            
            trace(o.salary);
            
// output: 1000
            
            
// delete只能删除动态添加的属性
            delete o.salary;
            trace(o.salary);
            
// output: undefined
        }

        
        
// 各个对象的默认值
        function showDefaultValue():void
        
{
            
var i:int;
            trace(i);
            
// output: 0
            
            
var u:uint;
            trace(u);
            
// output: 0
            
            
var n:Number;
            trace(n);
            
// output: NaN
            
            
var s:String;
            trace(s);
            
// output: null
            
            
var b:Boolean;
            trace(b);
            
// output: false
            
            
var a:Array;
            trace(a);
            
// output: null
            
            
var o:Object;
            trace(o);
            
// output: null
            
            
var d:Date;
            trace(d);
            
// output: null
            
            
var xxx;
            trace(xxx);
            
// output: undefined
            
            
var yyy:*;
            trace(yyy);
            
// output: undefined
        }

        
        
// 操作符
        function showOperator():void
        
{
            
/* 以下操作符同C#
            + - * / % 
            += -= *= /= %=
            == != 
            === !=== (操作符两边不做类型转换)
            >= <= > <
            && || !
            ? : 
            
*/

            
            
// 以字符串的形式返回对象的类型
            trace(typeof "webabcd");
            
// output: string
            
            
// 判断一个对象是否属于某一类型
            trace("webabcd" is String);
            
// output: true
            
            
// 如果对象属于某一类型,则返回该对象
            trace("webabcd" as String);
            
// output: webabcd
            
            
// 如果对象不属于某一类型,则返回null
            trace("webabcd" as Number);
            
// output: null
            
            
var ary:Array = [1,2,3];
            
// 判断一个对象是否属于某一集合
            trace(1 in ary);
            
// output: true
        }

        
        
// 流程控制语句
        function showFlowControl():void
        
{
            
/* 以下流程控制同C#
            if - else if - else
            while 循环
            do-while 循环
            for 循环
            switch - case
            break continue
            
*/

            
            
var ary:Array = [1,2,3];
            
// for each - in的枚举变量代表集合成员
            for each(var v in ary)
            
{
                trace(v)
            }

            
// output: 
            // 1
            // 2
            // 3
            
            
// for - in的枚举变量代表集合索引
            for (var k in ary)
            
{
                trace(ary[k])
            }

            
// output: 
            // 1
            // 2
            // 3
        }

    }

}


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posted @ 2007-11-13 08:28  webabcd  阅读(5816)  评论(18编辑  收藏  举报