cocos2d JS 设置字幕循环滚动(背景图滚动亦可)

 var dong = ccs.load("res/Login.json");
 this.addChild(dong.node);

 this.cShamNotice = ccui.helper.seekWidgetByName(dong.node,"cShamNotice");　//字幕背景框
 this.cShamNotice.setVisible(false);
 var str = "请各位玩家文明娱乐，远离赌博。如发现有赌博行为，将封停账号，并向xxxxx举报！诚招各级玩家代理，微信：xxxxxx";
 this.tfShamNotice = ccui.helper.seekWidgetByName(dong.node,"tfShamNotice");//文本txt
 this.tfShamNotice.setFontName(I18N.defaultFont);
 this.tfShamNotice.ignoreContentAdaptWithSize(true);
 this.tfShamNotice.setString(str);

 this.runShamNotice(true);

 //调用此方法计算坐标即可
 runShamNotice : function(bool) {
     if(bool) {
         this.cShamNotice.setVisible(true);

         var cWidth = this.cShamNotice.getContentSize().width;
         var cHeight = this.cShamNotice.getContentSize().height;
         var tfWidth = this.tfShamNotice.getContentSize().width;

         this.tfShamNotice.setPositionX(cWidth);

         var runAct = cc.sequence(cc.moveTo(20, -tfWidth, cHeight / 2), cc.callFunc(function() {
             this.tfShamNotice.setPositionX(cWidth);
         }, this), cc.delayTime(0.5));

         this.tfShamNotice.stopAllActions();
         this.tfShamNotice.runAction(cc.repeatForever(runAct));
     }else {
         this.cShamNotice.setVisible(false);

         this.tfShamNotice.stopAllActions();
     }
 }