动作加速度Speed

 1     //////////////////  动作加速度Speed   ///////////////
 2 
 3     Sprite* sprite = Sprite::create("button.png");
 4     sprite->setPosition(Vec2(visibleSize.width * 0.2, visibleSize.height * 0.5));
 5     this->addChild(sprite);
 6 
 7     ActionInterval *move = MoveTo::create(4, Vec2(visibleSize.width * 0.8, visibleSize.height * 0.5));
 8 
 9     // 参数( 动作，是原来的 2 倍 )
10     Speed *speed = Speed::create(move, 2);
11 
12     sprite->runAction(speed);
13 
14 
15     //////////////////  动作加速度Speed   ///////////////