测试环境 Flash CS5; 测试准备: 1、新建 ActionScript 3.0 工程; 2、在第一帧上点击右键 -> 动作, 打开代码输入窗口; 3、输入代码后, Ctrl+Enter 运行.
测试输出:
trace(123);trace("abc"); 变量与常量:
var a:int, b:int, c:int;a = b = c = 6;trace(a, b, c); //6 6 6const d:int = 123;trace(d);
数据类型:
//整形var iV1:int = -1;var iV2:int = new int(-2);var iV3:int = new int("-3");trace(iV1);trace(iV2);trace(iV3);//无符号整形var uV1:uint = 1;var uV2:uint = new uint(2);trace(uV1);trace(uV2);//浮点数var nV1:Number = 3.14159265;var nV2:Number = new Number(-3.14);trace(nV1);trace(nV2);//布尔值var bV1:Boolean = true;var bV2:Boolean = new Boolean(false);trace(bV1);trace(bV2);//字符串var sV1:String = 'ActionScript';var sV2:String = new String("万一的 Delphi 博客");trace(sV1);trace(sV2);/* Object *///Datevar dateVal:Date = new Date(2011, 5, 13);trace(dateVal.toString());//数组var sArr1:Array = ["spring", "summer", "autumn", "winter"];var sArr2:Array = new Array("spring", "summer", "autumn", "winter");trace(sArr1[0]);trace(sArr2[1]);var iArr = [11, 22, 33];trace(iArr[iArr.length-1]);//XMLvar xmlVal:XML = - AAA
- BBB
trace(xmlVal.item[0]); //AAA 数据类型默认值:
//整形var i:int;trace(i); //0trace(int.MIN_VALUE, int.MAX_VALUE); //-2147483648 2147483647//无符号整形var u:uint;trace(u); //0trace(uint.MIN_VALUE, uint.MAX_VALUE); //0 4294967295//浮点数var n:Number;trace(n); //NaNtrace(Number.MIN_VALUE, Number.MAX_VALUE); //4.9406564584124654e-324 1.79769313486231e+308//布尔值var b:Boolean;trace(b); //false//字符串var s:String;trace(s); //null//Objectvar obj:Object;trace(obj); //nullvar dt:Date;trace(dt); //null//未声明var arr:Array = [11, 22];trace(arr[1]); //22trace(arr[2]); //undefinedvar val;trace(val); //undefinedtrace(void); //undefined
类型转换:
//var i:int;i = int(true); trace(i); //1i = int(false); trace(i); //0i = int(5.67); trace(i); //5i = int(0x1A); trace(i); //26i = parseInt('3'); trace(i); //3i = int("4"); trace(i); //4//var n:Number;n = parseFloat("3.14159265"); trace(n); //3.14159265n = Number("3.14159265"); trace(n); //3.14159265//var b:Boolean;b = Boolean(-1); trace(b); //trueb = Boolean(0); trace(b); //falseb = Boolean(1); trace(b); //trueb = Boolean(2); trace(b); //trueb = Boolean(""); trace(b); //falseb = Boolean(" "); trace(b); //truevar obj1:Object;var obj2:Object = new Object();b = Boolean(obj1); trace(b); //falseb = Boolean(obj2); trace(b); //true//var str:String;var arr:Array = ["primary", "secondary", "tertiary"];str = String(arr); trace(str); //primary,secondary,tertiarystr = String(Math.PI); trace(str); //3.141592653589793 运算符:
[] //初始化数组{x:y} //初始化对象() //对表达式进行分组f(x) //调用函数new //调用构造函数x.y x[y] //访问属性<> //初始化 XMLList 对象 (E4X)@ //访问属性 (E4X):: //限定名称 (E4X).. //访问子级 XML 元素 (E4X)++ //递增(前缀、后缀)-- //递减(前缀、后缀)+ //一元 +- //一元 - （非）! //逻辑 NOT~ //按位 NOTdelete //删除属性typeof //返回类型信息void //返回未定义值* //乘/ //除% //求模+ //加- //减<< //按位左移位>> //按位右移位>>> //按位无符号右移位< //小于> //大于<= //小于或等于>= //大于或等于as //检查数据类型in //检查对象属性instanceof //检查原型链is //检查数据类型== //等于!= //不等于=== //全等!== //不全等& //按位 AND^ //按位 XOR| //按位 OR&& //逻辑 AND|| //逻辑 OR?: //三目运算符= //赋值*= //乘法赋值/= //除法赋值%= //求模赋值+= //加法赋值-= //减法赋值<<= //按位左移位赋值>>= //按位右移位赋值>>>= //按位无符号右移位赋值&= //按位 AND 赋值^= //按位 XOR 赋值|= //按位 OR 赋值 语句:
//if 语句if () { } else { }//三目var a:int, b:int, c:int;a = 1;b = 2;c = (a > b) ? a : b;trace(c); //2//switch 语句var dt:Date = new Date();var day:uint = dt.getDay();switch(day){ case 0: trace("Sunday"); break; case 1: trace("Monday"); break; case 2: trace("Tuesday"); break; case 3: trace("Wednesday"); break; case 4: trace("Thursday"); break; case 5: trace("Friday"); break; case 6: trace("Saturday"); break; default: trace("Out of range"); break;}//for 循环for (var i:int = 0; i < 5; i++){ trace(i);}//for in 循环var arr:Array = ["one", "two", "three"];for (var s:String in arr){ trace(s, ":", arr[s]);}/***********0 : one1 : two2 : three************/var obj:Object = {x:20, y:30};for (var s:String in obj){ trace(s, ":", obj[s]);}/***********y : 30x : 20************///for each 循环var arr:Array = ["one", "two", "three"];for each (var str in arr){ trace(str); //one/two/three}var obj:Object = {x:20, y:30};for each (var num in obj){ trace(num); //20/30}var myXML:XML = Jane Susan John ;for each (var item in myXML.fname){ trace(item); //Jane/Susan/John}//while 循环与 do while 循环var i:int;i = 0;while (i<5){ trace(i); //0/1/2/3/4 i++;}i = 5;do{ trace(i); //5 i++;} while(i<5); 函数:
//函数语句function Add(a:int, b:int):int{ return a + b;}trace(Add(1, 2)); //3//----------------------------------------------------------------//函数表达式var traceParameter:Function = function (str:String){ trace("Hello " + str);}; //分号traceParameter("ActionScript"); //Hello ActionScript//----------------------------------------------------------------//函数成员function Sum(a:int, b:int):int { return a+b; }var arr:Array = new Array();arr[0] = Sum;arr[1] = function(a:int, b:int) { return a*b; };trace(arr[0](3, 4)); //7trace(arr[1](3, 4)); //12//----------------------------------------------------------------//嵌套函数function myFun():String{ function Fun1():String { return "Hello"; } function Fun2():String { return "ActionScript"; } return Fun1() + " " + Fun2();}trace(myFun()); //Hello ActionScript//----------------------------------------------------------------//默认参数function Sum(a:int, b:int=2, c:int=3):int { return a+b+c; }trace(Sum(1)); //6//----------------------------------------------------------------//基本数据类型参数(Boolean、Number、int、uint、String)按值传递function Inc1(a:int):void { a++; }var b:int = 1;Inc1(b);trace(b); //1//对象参数按引用传递function Inc2(aObj:Object):void{ aObj.x++; aObj.y++;}var obj:Object = { x:1, y:2 };Inc2(obj);trace(obj.x, obj.y); //2 3//----------------------------------------------------------------//函数中的 arguments 对象function myFun(a:int, b:int, c:int):void{ for (var i:uint = 0; i< arguments.length; i++) { trace(arguments[i]); }}myFun(11, 22, 33); //11/22/33//arguments.callee 表示函数本身; 使用回调完成阶乘的例子:var factorial:Function = function (x:uint){ if(x == 0) { return 1; } else { return (x * arguments.callee(x - 1)); //同 return (x * factorial(x - 1)); }}trace(factorial(5)); //120//----------------------------------------------------------------//... (rest) 数组参数:function myFun(...myArgs):void{ for (var i:uint = 0; i < myArgs.length; i++) { trace(myArgs[i]); }}myFun(1, 2, 3); //1/2/3myFun("A", "B", "C", 1, 2, 3); //A/B/C/1/2/3 错误处理:
try { throw new Error("抛出错误"); trace("不会执行");} catch(e:Error){ trace(e.message);}finally { trace("是否发生错误都会执行");}