flex的number formatter示例

    <fx:Script>
        <![CDATA[
            import mx.events.ValidationResultEvent;

            private var vResult:ValidationResultEvent;

            // Event handler to validate and format input.
            private function Format():void {
                vResult = numVal.validate();
                if (vResult.type == ValidationResultEvent.VALID) {
                    formattedNumber.text = numberFormatter.format(inputVal.text);
                } else {
                    formattedNumber.text = "";
                }
            }
        ]]>
    </fx:Script>

    <fx:Declarations>
        <mx:NumberFormatter id="numberFormatter" precision="4" 
                useThousandsSeparator="true" useNegativeSign="true"/>

        <mx:NumberValidator id="numVal" source="{inputVal}" property="text" 
                allowNegative="true" domain="real"/>
    </fx:Declarations>