arrays - AS3 : AddChild based on Array Value

Question

假设我有一个数组，数组中的每个项目都有一个对应的库项目。

我想做这样的事情:

var rando = Math.round(Math.random()*3)
var myArray = new Array ["ball", "wall", "fall"]
var i:myArray[rando] = myArray[rando] new myArray[rando]()
addChild(i)

但是，这行不通。有什么 secret 吗？

谢谢，

维克多·雨果

Answer 1

很惊讶没有人提到getDefinitionByName()在这里。

这里有一些完整的代码，可以让您的示例正常工作:

var myArray = ["ball", "wall", "fall"];

/**
 * Creates a random instance based on an input array containing class names as Strings.
 * @param The input array containing aforementioned Strings.
 * @return The newly created instance.
 */
function createRandom(typeArray:Array):*
{
    // Select random String from typeArray.
    var selection:String = typeArray[ int(Math.random() * typeArray.length) ];

    // Create instance of relevant class.
    var Type:Class = getDefinitionByName(selection) as Class;

    // Return created instance.
    return new Type();
}


// Randomly create and add instance.
var instance:DisplayObject = createRandom(myArray);
addChild(instance);