flex BrowserChangeEvent

选项卡切换时load,
IBrowserManager---相关事件
browserURLChange 当浏览器更改 URL 时调度。 IBrowserManager
change 当通过用户与浏览器交互、调用 AIR 中的应用程序或以编程方式设置此属性来更改 URL 时调度。 IBrowserManager
urlChange 当应用程序更改 URL 时调度。 IBrowserManager

<?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/halo"
	   minWidth="1024" minHeight="768"
	   creationComplete="onCreationComplete()" xmlns:mx1="library://ns.adobe.com/flex/mx" >
<fx:Script>
<![CDATA[
	import mx.events.BrowserChangeEvent;
	import mx.managers.IBrowserManager;
	import mx.managers.BrowserManager;
	import mx.utils.URLUtil;
	private var bm:IBrowserManager;
	private function onCreationComplete() : void
	{
		bm = BrowserManager.getInstance();
		bm.init();
		updateContainers();
		bm.addEventListener( BrowserChangeEvent.BROWSER_URL_CHANGE,
			onURLChange );
		updateURL();
	}
	private function updateContainers():void
	{
		var o:Object = URLUtil.stringToObject(bm.fragment);
		if ( !isNaN(o.selectedIndex) )
		{
			var newIndex : Number = o.selectedIndex;
			if ( newIndex >= 0 && newIndex < tabNav.numChildren )
				tabNav.selectedIndex = newIndex;
		}
	}
	private function onURLChange( event:BrowserChangeEvent ):void
	{
		updateContainers();
	}
	private function updateURL():void
	{
		bm.setFragment( "selectedIndex=" + tabNav.selectedIndex );
	}
]]>
</fx:Script>
<mx1:TabNavigator bottom="10" top="10" right="10" left="10"
			 id="tabNav" historyManagementEnabled="false" >
<s:NavigatorContent label="Tab 0" show="updateURL()" >
	<s:Label text="Tab 0 Contents" />
</s:NavigatorContent>
<s:NavigatorContent label="Tab 1" show="updateURL()" >
	<s:Label text="Tab 1 Contents" />
</s:NavigatorContent>
<s:NavigatorContent label="Tab 2" show="updateURL()" >
	<s:Label text="Tab 2 Contents" />
</s:NavigatorContent>
</mx1:TabNavigator>
</s:Application>