Flex4学习笔记1---基本语法

<?xml version="1.0" encoding="utf-8"?>

<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"

               xmlns:s="library://ns.adobe.com/flex/spark"

               xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="1023" minHeight="800">

    <fx:Declarations>

        <!-- 将非可视元素（例如服务、值对象）放在此处 -->

    </fx:Declarations>

    <s:Button label="我爱北京天安门" width="500" height="50">    </s:Button>

    <!-- 弹出框-->

    <fx:Script>

        <![CDATA[

            import mx.controls.Alert;

            public function handeEvent():void{

                mx.controls.Alert.show("你好厦门");

            }

        ]]>

    </fx:Script>

    <s:Button label="点击我" click="handeEvent()" x="100" y="100"/>

    <!-- 测试代码-->

    <fx:Script>

        <![CDATA[

            //弹出框

            import mx.controls.Alert;

            public function clickHandler(clickEvent:Event):void

            {

             Alert.show("Envent Type:"+clickEvent.type+"----------"+"came from"+clickEvent.currentTarget.id);

            }

        ]]>

    </fx:Script>

    <s:Button id="Me" label="点解我丫丫丫丫" click="clickHandler(event)" x="100" y="200"/>

    <!--使用if else 检查密码-->

    <fx:Script>

        <![CDATA[

            import mx.controls.Alert;

            public function checkPassword():void

            {

              if(password.text.length<1)

                  Alert.show("没有输入密码");

              else if (password.text.length <5)

              { Alert.show("没有输入足够长的密码");}

              else Alert.show("输入了密码 ");

            }

        ]]>

    </fx:Script>

    <s:Group>

        <s:layout>

            <s:VerticalLayout/>

        </s:layout>

        <s:TextInput id="password"/>

        <s:Button label = "检查密码" click = "checkPassword()" x="100" y ="400"/>

    </s:Group>

</s:Application>

2、

x++，先使用原值，再加1.

++x,先加1，在使用原值。

var x:int=0

trace(x++);/输出0，然后后x的值增加1

trace(x);//输出1

3、函数返回值

<!--创建返回-->

    <fx:Script>

        <![CDATA[

            import mx.controls.Alert;

            public function textMerge(input1:String,input2:String):String

            {

                var x:String = input1 + input2;

                return x;

            }

        ]]>

    </fx:Script>

    <s:Group x="100" y ="400">

        <s:layout>

            <s:HorizontalLayout/>

        </s:layout>

        <s:TextInput id="value1"/>

        <s:Label text="and"/>

        <s:TextInput id="value2"/>

        <s:Button label="两字符串相加" click="Alert.show(textMerge(value1.text,value2.text))"/>

    </s:Group>