flex 去除Array中的重复数据 过滤重复值 （转载）

<?xml version="1.0" encoding="utf-8"?> 
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" 
				layout="vertical" 
				verticalAlign="middle" 
				backgroundColor="white" 
				creationComplete="init()"> 
	
	<mx:Script> 
		<![CDATA[ 
			private var keys:Object = {}; 
			private function init():void { 
				var arr:Array = []; 
				arr.push(1); 
				arr.push(1); 
				arr.push(7); 
				arr.push(4); 
				arr.push(4); 
				arr.push(5); 
				arr.push(6); 
				
				/* Filter the original array and call the 
				removeDuplicates() function on each item 
				in the array. */ 
				
				var filteredArr:Array = arr.filter(removedDuplicates); 
				
				arrColl.source = arr; 
				dedupedArrColl.source = filteredArr; 
			} 
			
			/** 
			 * This method is used to filter an array so that no 
			 * duplicate items are created. It works by first 
			 * checking to see if a keys object already contains 
			 * a key equal to the current value of the item.data 
			 * value. If the key already exists, the  current item 
			 * will not be readded to the data provider. If the key 
			 * does not already exist, add the key to the keys 
			 * object and add this item to the data provider. 
			 */ 
			
			private function removedDuplicates(item:Object, idx:uint, arr:Array):Boolean { 
				if (keys.hasOwnProperty(item)) { 
					return false; 
				} else { 
					keys[item] = item; 
					return true; 
				} 
			} 
		]]> 
	</mx:Script> 
	
	<mx:ArrayCollection id="arrColl" /> 
	<mx:ArrayCollection id="dedupedArrColl" /> 
	
	<mx:HBox> 
		<mx:VBox> 
			<mx:Label text="Original ({arrColl.length} items):" /> 
			<mx:List dataProvider="{arrColl}" /> 
		</mx:VBox> 
		<mx:VBox> 
			<mx:Label text="Filtered ({dedupedArrColl.length} items):" /> 
			<mx:List dataProvider="{dedupedArrColl}" /> 
		</mx:VBox> 
	</mx:HBox> 
	
</mx:Application>