获取swf布尔参数

Question

我有一个 swf，我称之为

/SWFUploader/upload.swf?single=true

然后在 ActionScript 3 中我读入该值。但这不起作用。这是我的测试代码（第一个块取自 http://blogs.adobe。 com/pdehaan/2006/07/using_flashvars_with_actionscr.html ）：

var keyStr:String;
var valueStr:String;
var paramObj:Object = LoaderInfo(this.root.loaderInfo).parameters;
for (keyStr in paramObj) {
    valueStr = String(paramObj[keyStr]);
    trace(keyStr + " = " + valueStr);
}

var isSingle:Boolean = this.loaderInfo.parameters.single as Boolean;
var isSingle1:Boolean = this.loaderInfo.parameters['single'] as Boolean;
var isSingle2:Boolean = LoaderInfo(this.root.loaderInfo).parameters['single'] as Boolean;
var isSingle3:Boolean = LoaderInfo(this.root.loaderInfo).parameters.single as Boolean;
trace(isSingle + ", " + isSingle1 + ", " + isSingle2 + ", " + isSingle3);

令人沮丧的是，这是结果两个跟踪的行：

single = true
false, false, false, false

我做错了什么？

Answer 1

在 ActionScript 中，非空且非 null 字符串将转换为布尔值 true。

var singleStr:String = this.loaderInfo.parameters.single;
var singleBool:Boolean = singleStr == "true";