Flex 基本语法

1 Flex 变量

?? ? ? ? ?var?v1:int?=?9;?//int v1 = 9;
??????????var?v2:uint?=?10;
??????????var?v3:Boolean?=?true;
??????????var?v4:Number?=?4.5;
??????????var?v5:String?=?"HelloWorld";
??????????var?v6:String?=?'HelloWorld?Again';
??????????var?v7:*?=?3;??//*类型：任意数据类型
??????????trace(v7);
??????????v7?=?'hello';
??????????trace(v7);
??????????var?v8;??????//v8只定义没赋值，为undefined
??????????trace("v8=",v8);
??????????var?v9:String;
??????????trace(v9);??//String 类似java中的null
??????????var?v10:Array?=?[2,?3,?4,?5];?//数组
??????????trace(v10);
??????????var?v11:Object?=?{id:3,?name:"zhangsan",age:18};???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????//map v11是个对象类型，写了个大括号，里面是 属性-值 格式，类似json，或者叫关联性数组。
??????????trace(v11.name);
Flex中定义变量的格式为:?var?name:type?[?=?initvalue]

2 Flex中语句

var?v1:Array?=?["a",?"b",?"c",?"d"];
for(var?i:String?in?v1)?{
????//trace(i);? // 0 1 2 3
????trace(v1[i]);?// a b c d
}

for?each?(var?propertyValue:String?in?v1)?{
????trace(propertyValue);// a b c d
}

var?v2:Object?=?{id:1,?name:'lisi',?age:19};
for(var?i?in?v2)?{
????trace(i);????????//name id age
????trace(v2[i]);????//lisi 1 19
}

for?each?(var?propertyValue?in?v2)?{
????trace(propertyValue);?????//lisi 1 19?
}

trace(v2["name"]);????????????//lisi

语句中的for?var?i?是map中的key-value的key，而arr[i]指的是value，

??for?each是取出value。

3 函数

?? ?public?function?AS_0400_Functions()

{
????//声明一个匿名函数类型变量traceParameter，定义在后面
????var?traceParameter:Function?=?function?? (aParam:String)?:void//void f(String aParam)
????{
????????trace(aParam);
????};
????traceParameter("hello");?// hello
????
????
????var?traceArray:Array?=?new?Array();?//定义一个数组
????//数组的0号位置存储了一个函数变量，匿名函数变量，带一个String类型参数
????traceArray[0]?=?function?(aParam:String):void?
????{
????????trace(aParam);
????};
????traceArray[0]("hello");
????
????f();
????f('lisi');
????
????f2(1,?5,?6,?8);
????
????var?arr?:?Array?=?["hello world!","syx",19];
????say(arr,"test",[1,2,2]);
}
//函数 可以有默认参数值
public?function?f(name:String?=?'zhangsan')?:?void?{
????trace(name);
}

//函数可以有变参
//args 是一个存储Object类型的数组
public?function?f2(...args):?void?{
????
????trace(args.length);
????for?each(var?value:String?in?args)?{
????????trace(value);
????}
}

public?function?say(...args):?void?{
????var?strTemp?:?String?=?"";
????for?each(var?value?:?String?in?args)?{
????????strTemp?+=?value?+?":";
????}
????trace(strTemp);
}

4 Flex中面向对象思想

入口： ? ? ?

      var s:Student = new Student();//定义对象
      trace(s.name);//zhangsan
      var t:Teacher = new Teacher();
      t.f = function() {//给t增加一个函数
            trace("f");
      }
      t.f();// f
      delete t.f;
      var f:IFlyable = new T();
      t.f();  // TypeError: Error #1006: f 不是函数。

?? 类：

package com.syx.flex.test{
      public class Student{
            private var _name:String = 'zhangsan';
            public function Student() {}
            public function set name(name:String) : void { //setName
            this._name = name;
      }

      public function get name():String {
            return this._name;
      }
}

接口：

package com.syx.flex.test{
      public interface IFlyable {
            function fly():void;
      }
}

实现：

package com.syx.flex.test{
      public class Bird implements IFlyable  {
            public function Bird()  {

            }

            public function fly():void {
                  trace("bird fly!");
            }
      }

}

多态：

      var f:IFlyable = new Bird();

      f.fly();

5 简单字符串处理

var s:String = "syx";
for(var i:int=0; i<s.length; i+=1) {
      trace(s.charAt(i),s.charCodeAt(i) );
}
trace(s.concat(" hellow"," world"));
trace(s.toUpperCase());

6 数组

var a1 : Array = [1,2,3];
var a2 : Array = ["a","b","c"];
var a3 : Array = new Array();
trace(a3.push("one"));//1
trace(a3.push("two"));//2
trace(a3.push("three"));//3
trace(a3);//one,two,three
var a4 : Array = new Array(3);
trace(a4.length);//3
trace(a4[0]);//undefined
var a5 : Array = new Array('zhangsan','lisi','wangwu');
a5.unshift('zhaoliu');
trace(a5);//zhaoliu,zhangsan,lisi,wangwu
//function splice(startIndex:int,deleteCount:uint,... values):Array
a5.splice(1,'sunqi','liuba');
//删除1位置后0个元素（包括1），在插入...args
trace(a5);//zhaoliu,sunqi,liuba,wangwu
a5.splice(1,2);
trace(a5);//zhaoliu,wangwu
//Removes the last element from an array and returns the value of that element
a5.pop();
//Removes the first element from an array and returns that element.
a5.shift();
delete a5[0]; //a5[0] = 'undefined'
trace(a5[0]);//undefined
//Reverses(逆序) the array in place
a5.reverse();
//Sorts the elements in an array. This method sorts according to 
//Unicode values. (ASCII is a subset of Unicode.) 
a5.sort();
a5.sort(Array.CASEINSENSITIVE);
a5.sort(Array.DESCENDING | Array.CASEINSENSITIVE );

var poets:Array = new Array();
poets.push({name:"Angelou",born:"1928"});
poets.push({name:"Blake",born:"1757"});
poets.push({name:"cummings",born:"1894"});
poets.push({name:"Dante",born:"1265"});
poets.push({name:"Wang",born:"701"});
poets.sortOn("born",Array.NUMERIC);

7 异常处理

var a :Array = [1,3];
try {
      throw new EOFError("error occur");
} catch (error:EOFError) {
     trace(error);
} finally {
     trace("finally");
}