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MovieClip.prototype._oldlm = MovieClip.prototype.loadMovie;
MovieClip.prototype.loadMovie = function() {
	this._oldlm(prefix + arguments[0]);
};
//请解释一下：MovieClip.prototype._oldlm = MovieClip.prototype.loadMovie;
//这句的用意，说明一下在AS2.0中怎样替代

class MyMovieClip extends MovieClip {
	public function _oldlm(arg1, arg2, arg3) {
		super.loadMovie(arg1, arg2, arg3);
	}
	public function loadMovie() {
		this._oldlm(arguments[0]);
	}
}