Flex 数组（Array）属性使用及数组的遍历

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical" verticalAlign="middle" backgroundColor="white" initialize="onInit()"> <mx:Style> .greenModal { modalTransparencyColor: haloGreen; } .redModal { modalTransparencyColor: red; } </mx:Style> <mx:Script> <!--[CDATA[ import mx.controls.Alert; import mx.utils.StringUtil; private var array:Array=[{label: "AAAAA",data: 5},{label: "BBBBB",data: "liu"},{label: "CCCCC",data: 3},{label: "DDDDD",data: 2},{label: "EEEEE",data: 1}]; private var newArray:Array=[{label: "桌子",data: 123.5},{label: "电脑",data: 4741}]; private var arr0:Array=["AAAAA","DDDDD","YYYYY"]; private function onInit():void { var concatArray:Array=array.concat(newArray); } //Array.concat属性 private function concatArray(arr1:Array,arr2:Array):void { var arr:Array=arr1.concat(arr2); dataGrid.dataProvider=arr; } //Array.join属性 private function joinArray():void { textArea.text=arr0.join(" ___/n"); dataGrid.dataProvider=arr0; } //Array.reverse private function reverseArray():void { arr0.reverse(); dataGrid.dataProvider=arr0; textArea.text=arr0.join("/n"); } //Array.map private function mapArray():void { var upperArray:Array=arr0.map(toUpper); dataGrid.dataProvider=upperArray; } private function toUpper(element:*,index:int,arr:Array):String { return String(element).toLowerCase(); } //for each private function forEachArray():void { array.forEach(forEach); dataGrid.dataProvider=array; } private function forEach(element:*,arr:Array):void { element.data=element.data+10; } //some,当有一个条件满足时就返回结果true,和every相对应，every是全部满足返回true private function someArray():void { textArea.text=""; var success:Boolean=array.some(isNumeric); dataGrid.dataProvider=array; if(success) { Alert.show("Success.","Result",Alert.OK); } else { Alert.show("failed.",Alert.OK); } } //Array.every属性,与for each不同，for each会执行完第个元素，every则是当有一个不满足条件时就返回false结果 private function checkArray(arr:Array):void { textArea.text=""; dataGrid.dataProvider=arr; //验证数组的全部元素属性是否满足条件 var success:Boolean=arr.every(isNumeric); if (success) { Application.application.styleName="greenModal"; Alert.show("Array is numeric.",// text "SUCCESS",// title Alert.OK,// flags null,// parent null); // closeHandler } else { Application.application.styleName="redModal"; Alert.show("Array has non-numeric elements.","ERROR",Alert.OK,null,null); } } private function isNumeric(element:Object,arr:Array):Boolean { if((element.hasOwnProperty("data")) && (element.data is Number)) { var str:String=StringUtil.substitute("{0} ({1})/n",element.label,element.data); textArea.text+=str; return true; }else return false; } ]]--> </mx:Script> <mx:ApplicationControlBar dock="true"> <mx:Button label="Concat" click="concatArray(array,newArray);"/> <mx:Button label="Join" click="joinArray();"/> <mx:Button label="Reverse" click="reverseArray();"/> <mx:Button label="Map" click="mapArray();"/> <mx:Button label="ForEach" click="forEachArray();"/> <mx:Button label="Some" click="someArray();"/> <mx:Button label="Check Array 1" click="checkArray(array);"/> <mx:Button label="Check Array 2" click="checkArray(newArray);"/> </mx:ApplicationControlBar> <mx:HBox> <mx:DataGrid id="dataGrid" rowCount="7"> <mx:columns> <mx:DataGridColumn dataField="label"/> <mx:DataGridColumn dataField="data"/> </mx:columns> </mx:DataGrid> <mx:TextArea id="textArea" editable="false" width="{dataGrid.width}" height="{dataGrid.height}"/> </mx:HBox> </mx:Application>

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Filter :

<?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={}; /** * Called by the Application container's creationComplete * event handler. This method creates a new Array object * which will be used as a data provider as well as a * filtered view of that array which does not contain * duplicated items. */ private function init():void { /* Create a dummy data source with some semi-random data. */ var arr:Array=[]; arr.push({data: 1,label: "one"}); arr.push({data: 1,label: "one"}); arr.push({data: 2,label: "two"}); arr.push({data: 2,label: "two"}); arr.push({data: 1,label: "one"}); arr.push({data: 3,label: "three"}); arr.push({data: 3,label: "three"}); /* 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.label)) { /* If the keys Object already has this property,return false and discard this item. */ return false; } else { /* Else the keys Object does *NOT* already have this key,so add this item to the new data provider. */ keys[item.label]=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>

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搜索数组元素时，可以使用for语句配合break语句

for(var i:int=0;i<array.length;i++) { if(array[i]==match) { trace("Element with index "+i+"found to match "+match); break; } }

但上面这种方法效率不高，在ascb.util.ArrayUtilities类中，提供了findMatchIndex,findLastMatchIndex和findMatchIndices三种方法来搜索数组元素。

使用方法如下，ArrayUtilities.findMatchIndex(数组对象，需要匹配的值，搜索开始下标，布尔值)；

其中搜索开始下标默认为0。布尔值表示是否返回部分匹配元素，默认为false，即不返回部分匹配元素。

findLastMatchIndex返回最后一个匹配的元素下标。findMatchIndice返回所有匹配的元素下标数组（注意：返回的结果是下标的数组）。