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//循环倒播方法
prev_btn.onRelease = function() {
        var vfmC:Number = tu._currentframe;
        var vfmT:Number = tu._totalframes;
        tu.gotoAndStop((vfmC-1-1+vfmT)%vfmT+1);//吉人循环倒播精华
//特别的这里如果把vfmC-1-1中的后一个-1换成一个变量vx，即有vfmC-1+vx，则
//实现了当vx为正值1时为顺播，当vx为负值1时为倒播，当vx为正负除1外的数值时
//实现了跳播作用。请深入理解tu.gotoAndStop((vfmC-1+vx+vfmT)%vfmT+1);
};

//==================================================================
//循环倒播方法又一方法
function qian() {
 onEnterFrame = function () {
  if (this._currentframe == this._totalframes) {
   gotoAndPlay(1);
  } else {
   nextFrame();
  }
 };
}
function hou() {
 onEnterFrame = function () {
  if (this._currentframe == 1) {
   gotoAndPlay(this._totalframes);
  } else {
   prevFrame();
  }
 };
}

 源文件下载

var vx:Number;
function zhuan() {
 onEnterFrame = function () {
  var zh = _mc._totalframes;
  var dz = _mc._currentframe;
  _mc.gotoAndStop((dz-1+vx+zh)%zh+1);
 };
}
shun_btn.onRelease = function() {
 vx = 1;
 zhuan();
};
ni_btn.onRelease = function() {
 vx = -1;
 zhuan();
};
m_mc.onRelease = function() {
 //_root._mc.stop();//这句可以不要
 delete onEnterFrame;
};