Flex中方法调用顺序的思考

最新推荐文章于 2021-02-23 13:10:58 发布

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最新推荐文章于 2021-02-23 13:10:58 发布

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分类专栏： Flex积累文章标签： Flex Flash XML Blog

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本文通过一个Flash实例展示函数调用顺序与执行顺序的区别。使用ActionScript编程，通过设置不同间隔时间的定时器，观察函数的实际执行顺序，并非完全遵循调用顺序。

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通过这个例子是不是可以说:[color=red]函数的调用顺序不一定决定函数的执行顺序.[/color]


<?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="955" minHeight="600">
	<s:layout>
		<s:BasicLayout/>
	</s:layout>
	<fx:Declarations>
		<!-- Place non-visual elements (e.g., services, value objects) here -->
	</fx:Declarations>
	<fx:Script>
		<![CDATA[
			/* */
			import flash.utils.*;
			private var id1:uint;
			private var id2:uint;
			private var id3:uint;
			private function reset_textarea():void
			{
				textarea.text = "";
			}

			private function start_textarea():void
			{
				id1 = flash.utils.setInterval(fun1,1000);
				id2 = flash.utils.setInterval(fun2,950);
				id3 = flash.utils.setInterval(fun3,850);
			}
			private function stop_textarea():void
			{
				clearInterval(id1);
				clearInterval(id2);
				clearInterval(id3);
			}
			/* demo function defined */
			private function fun1():void
			{
				if(textarea.text!=null)
				{

					textarea.text = textarea.text+"fun1()";
				}
			}

			private function fun2():void
			{
				if(textarea.text!=null)
					textarea.text = textarea.text + "fun2()";
			}

			private function fun3():void
			{
				if(textarea.text!=null)
					textarea.text = textarea.text + "fun3()\r\n";
			}
		]]>
	</fx:Script>
	<s:Panel x="227.6" y="164.45" width="500" height="291" title="ActionScript函数调用顺序演示">
		<s:TextArea id="textarea" x="101" y="10" editable="false" width="304" height="149">

		</s:TextArea>
		<s:Button label="Start" x="96" y="226" click="start_textarea()"/>
		<s:Button label="clear" x="335" y="227" click="reset_textarea()"/>
		<s:Button label="Stop" x="219" y="228" click="stop_textarea()"/>
	</s:Panel>
</s:Application>

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