添加一个子节点后，runAction不能运行

Cocos2d-x JavaScript
#1 
var rand = Math.random();
        num = Math.floor(rand * this.range);
        let children = this.node.children;
        let judge = cc.find("Canvas/judge");
        cc.log("cardgroup:",children.length);
        cc.log("random card id:",num);
        children[num].active = true;//???????
        // children[num].x = -400;
        cc.log(children[num].name);
        let finished = cc.callFunc(function (target){
            let bt_node = children[num];
            bt_node.parent = judge; 
            bt_node.x = 0;
            this.range -= 1;
            cc.log("range:",this.range);
            let msgForDispatchEvent = new cc.Event.EventCustom("card", true);
            msgForDispatchEvent.detail = bt_node.cardid;
            bt_node.dispatchEvent(msgForDispatchEvent);
            cc.log(bt_node.parent.name);
        }, this, 100);
        let action = cc.sequence(cc.moveTo(0.5, 400, 0), cc.scaleTo(1.25,1.25), cc.scaleTo(1,1), finished);
        children[num].runAction(action);