如何突破Class中的范围限制

class testing {
function testing() {
trace(this); //在这里的this是指testing本身
var myKey:Object = new Object();
myKey.onKeyDown = function() {
trace(this); //这里的this是指myKey
echo ("突破范围限制"); //当然你也可以使用_root.test.echo(), 但是这样的代码就无法灵活的应用在其他地方了
}
Key.addListener(myKey);
}
private function echo(str:String) {
trace(str);
}
}
---------------------- FLA ---------------------------
var test:testing = new testing();
解决方法很简单， 如下：
class testing {
function testing() {
var root:Object = this;
var myKey:Object = new Object();
myKey.onKeyDown = function() {
root.echo ("突破范围限制");
}
Key.addListener(myKey);
}
private function echo(str:String) {
trace(str);
}
}