ImageView fade not work in JSB

cocos2d-x JavaScript
#1 
    var box = ccui.ImageView.create('xxx.png',ccui.Widget.PLIST_TEXTURE);
    var delay = cc.delayTime(0.25);
    var action = cc.fadeIn(2);
    var action_back = action.reverse();
    var fade = cc.sequence(action, delay, action_back).repeatForever();
    box.runAction(fade);
    addLayer.addChild(box,0,0);

above code can work in Web, but in JSB does not work, is a bug?
RC2

#2

test pls
var action_back = cc.fadeOut(2);