我的manager,这里是淡入淡出效果，可以扩展其他效果

var manager = cc.Class({
    extends: cc.Component,

    properties: {
        layerNum: {
            type: cc.Integer, //使用整型定义
            default: 0,
            //使用notify函数监听属性变化
            notify(oldValue) {
                //减少无效赋值
                if (oldValue === this.layerNum) {
                    return;
                }
                // this.node.index = this.layerNum;
                this.index = this.layerNum;
            }
        }
    },

    // LIFE-CYCLE CALLBACKS:

    // onLoad () {},

    start () {
        // this.node.index = this.layerNum
        this.index = this.layerNum
        var self = this
        // cc.log(this)
        // cc.log(this.node)
        // this.node.index = 0        
        // cc.log(children)
        this.children = this.node.getChildren();
        // cc.log(this.children)
        this.children.forEach(function(item, index){
            // cc.log(self.node.index)
            // cc.log(index)
            if(self.index === index){
                item.active = true
            }else{
                item.active = false
            }
        })

    },

    next () {
        var children = this.children
        // cc.log(children)
        // cc.log(this.index, children.length)
        // cc.log(this.index < children.length)
        if(this.index < children.length - 1){
            // children[this.index].active = false
            // children[this.index+1].active = true
            children[this.index].runAction(cc.fadeOut(0.8))
            children[this.index+1].opacity = 0
            children[this.index+1].active = true
            children[this.index+1].runAction(cc.fadeIn(0.8))
            this.index++
        }else{
            cc.log('finish')
        }
    }

    // update (dt) {},
});