class catchError {
    private var i:Number;					//递归计数
    private static var RECUR_NUM:Number=250;//定义级数.
    function test() {
        i = RECUR_NUM;
        try {
            show(0);
        } catch (e) {
            trace(e);
        }
    }
    private function show(k:Number):Void {	//递归方法
        trace(k);
        count();		//计数
        show(k+1);		//递归
    }
    private function count():Void {			//计数器
        i--;
        if (i<=0) {
            i=RECUR_NUM;
            throw new Error("error:recursion is beyond 256 levels");
        }
    }
}

/*
usage:

var e:catchError = new catchError();
e.test();

trace:

0
1
2
......
248
249
error:recursion is beyond 256 levels

*/