AS3使默认数组起作用:函数示例(human:Array = ["heart"，"skull"])? [英] AS3 making a default array work: function example(human:Array = ["heart","skull"])?

问题描述

因此唯一可行的方法是:

So the only thing that seems to work is:

function example(human:Array = null)
{
  if (human == null)
  human = ["heart","skull"]
}

为什么可以这样做:

function example(human:String = "Heart"){}
function example(human:Number = 1){}

但是

function example(human:Array = ["Heart","Chest"])

给我:

 Scene 1, Layer 'Layer 1', Frame 1, Line 1  1047: Parameter initializer unknown or is not a compile-time constant.

if语句是制作默认数组参数的唯一方法吗?

Is the if statement the only work around to making a default array parameter?

推荐答案

ActionScript仅允许将编译时常量(字符串，数字，int，null)作为默认参数.数组和对象实例不能为常量，因为它们是引用.因此，您不能将它们用作默认参数.

ActionScript only allows compile-time constants (string, number, int, null) as default parameters. Arrays and object instances cannot be constants because they are references. Hence, you cannot use them as default parameters.

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