我需要使用pop（）來取出一個組合框（數組），我已經創建了一個選項...但被卡住了

Question

我需要使用pop（），以便取出最後一個元素數組（它位於組合框中），但這不起作用...請幫助！

p.s.我沒有得到任何錯誤，當我運行的代碼一切工作正常，所以不會按鈕：

我的代碼：

var barColours:Array = new Array(); 
barColours = ["red", "green", "blue", "orange", "purple"]; 

comboBox.dataProvider = new DataProvider(barColours); 
comboBox.addEventListener(Event.CHANGE, onChange); 
comboBox.x = 670; 
comboBox.y = 55; 

minus_btn.addEventListener(MouseEvent.CLICK, takeAwayCol); 

function takeAwayCol(ev:MouseEvent):void 
{ 
     barColours.pop(); 
} 

Answer 1

修改數組不「通知」的變化的列表，則」我們需要重新分配dataProvider。

var barColours:Array = new Array(); 
barColours = ["red", "green", "blue", "orange", "purple"]; 

comboBox.dataProvider = new DataProvider(barColours); 
comboBox.addEventListener(Event.CHANGE, onChange); 
comboBox.x = 670; 
comboBox.y = 55; 

minus_btn.addEventListener(MouseEvent.CLICK, takeAwayCol); 

function takeAwayCol(ev:MouseEvent):void 
{ 
     barColours.pop(); 
     comboBox.dataProvider = new DataProvider(barColours); 
} 

根據註釋EDITED

var barColours:Array = ["red", "green", "blue", "orange", "purple"]; 
var removedBarColours:Array = new Array(); 

comboBox.dataProvider = new DataProvider(barColours); 
comboBox.addEventListener(Event.CHANGE, onChange); 
comboBox.x = 670; 
comboBox.y = 55; 

minus_btn.addEventListener(MouseEvent.CLICK, takeAwayCol); 

function takeAwayCol(ev:MouseEvent):void 
{ 
//if you need to pull from the beginning of the list instead of the end use shift/unshift method(s) of Array 
     removedBarColours.push(barColours.pop()); 
     comboBox.dataProvider = new DataProvider(barColours); 
} 

function addCol(ev:MouseEvent):void 
{ 
     barColours.push(removedBarColours.pop()); 
     comboBox.dataProvider = new DataProvider(barColours); 
}