今天碰到一個(gè)需求，要在動(dòng)作結(jié)束的回調(diào)函數(shù)中取到當(dāng)前動(dòng)作的精靈，實(shí)現(xiàn)在執(zhí)行動(dòng)作之后自動(dòng) remove 掉這個(gè)精靈。查了一下，沒有結(jié)果。然后看了一下 API ，發(fā)現(xiàn)利用 cc.CallFunc 構(gòu)造函數(shù)中的 data 參數(shù)可以解決這個(gè)問題。
下面是 cc.CallFunc 的構(gòu)造函數(shù)和 init 方法的實(shí)現(xiàn)：

ctor:function(selector, selectorTarget, data){
    cc.FiniteTimeAction.prototype.ctor.call(this);

    if(selector !== undefined){
        if(selectorTarget === undefined)
            this.initWithFunction(selector);
        else this.initWithFunction(selector, selectorTarget, data);
    }
},


initWithFunction:function (selector, selectorTarget, data) {
    if (selectorTarget) {
        this._data = data;
        this._callFunc = selector;
        this._selectorTarget = selectorTarget;
    }
    else if (selector)
        this._function = selector;
    return true;
},

參數(shù) selector 和 selectorTarget 不贅述。注意到在 init 方法中，將 ctor 方法傳入的 data 賦給了 this 的 _data 。
再看它的 execute 方法 ：

execute:function () {
    if (this._callFunc != null)         //CallFunc, N, ND
        this._callFunc.call(this._selectorTarget, this.target, this._data);
    else if(this._function)
        this._function.call(null, this.target);
},

在執(zhí)行這個(gè)回調(diào)的時(shí)候?qū)?this._data 傳入了原方法中，這樣我們就可以將當(dāng)前動(dòng)作精靈指針傳入回調(diào)函數(shù)，并在回調(diào)中取得它。

先構(gòu)造一個(gè)動(dòng)作隊(duì)列并運(yùn)行，代碼如下：

    var actionSprite = new cc.Sprite("res/me.png");
    actionSprite.setAnchorPoint(0, 0);
    actionSprite.x = 0;
    actionSprite.y = 0;
    this.addChild(actionSprite, 1);
    
    var moveAction0 = cc.MoveBy(0.5, cc.p(cc.winSize.width/2, 0));
    var moveAction1 = cc.MoveBy(0.5, cc.p(0, cc.winSize.height/2));
    var moveAction2 = cc.MoveBy(0.5, cc.p(-cc.winSize.width/2, 0));
    var moveAction3 = cc.MoveBy(0.5, cc.p(0, -cc.winSize.height/2));
    var actionCallbackFunction = cc.CallFunc(this.actionCallbackFunction, this);
    var actionFinishCallbackFunction = cc.CallFunc(this.actionFinishCallFunction, this);
    var actionArray = [];
    actionArray.push(moveAction0);
    actionArray.push(actionCallbackFunction);
    actionArray.push(moveAction1);
    actionArray.push(actionCallbackFunction);
    actionArray.push(moveAction2);
    actionArray.push(actionCallbackFunction);
    actionArray.push(moveAction3);
    actionArray.push(actionFinishCallbackFunction);
    var actionSequence = cc.Sequence(actionArray);
    actionSprite.runAction(actionSequence);
    
    
},

    actionCallbackFunction : function(){
        cc.log("Action Callback Function");
},

    actionFinishCallFunction : function(){
        cc.log("Action Finish Callback Function");
},

下面對(duì)以上代碼做一下小修改，來取得執(zhí)行動(dòng)作的精靈。
首先我們?cè)跇?gòu)造回調(diào)函數(shù)時(shí)要將精靈的指針作為 data 參數(shù)傳入：

    var actionCallbackFunction = cc.CallFunc(this.actionCallbackFunction, this, actionSprite);
    var actionFinishCallbackFunction = cc.CallFunc(this.actionFinishCallFunction, this, actionSprite);

其次我們要在定義回調(diào)方法的參數(shù)表中加入 data ，以便在函數(shù)實(shí)現(xiàn)中使用它：

actionCallbackFunction : function(data){
    cc.log("Action Callback Function");
    if (data != null && data != "undefine"){
        cc.log("Get Data");
        cc.log(typeof data);
        cc.log(data.x);
        cc.log(data.y);
    }
},

actionFinishCallFunction : function(data){
    cc.log("Action Finish Callback Function");
    if (data != null && data != "undefine"){
        cc.log("Get Data");
        cc.log(typeof data);
        cc.log(data.x);
        cc.log(data.y);
    }
    data.removeFromParent();
},

運(yùn)行試試看～

控制臺(tái)這一部分輸出為：

JS: Action Callback Function
JS: Get Data
JS: object
JS: 400
JS: 0
JS: Action Callback Function
JS: Get Data
JS: object
JS: 400
JS: 225
JS: Action Callback Function
JS: Get Data
JS: object
JS: 0
JS: 225
JS: Action Finish Callback Function
JS: Get Data
JS: object
JS: 0
JS: 0

看到在每一次動(dòng)作執(zhí)行完畢后輸出 data 類型為 object 和精靈當(dāng)前的坐標(biāo)，最后的 removeFromParent() 也成功了。

接下來試一下來構(gòu)造一個(gè)函數(shù)，返回一個(gè)動(dòng)作隊(duì)列。這樣，只要?jiǎng)?chuàng)建動(dòng)作隊(duì)列然后在精靈上 runAction 就自動(dòng)實(shí)現(xiàn)了精靈動(dòng)作并在動(dòng)作結(jié)束之后自動(dòng)清掉這個(gè)精靈。
創(chuàng)建動(dòng)作隊(duì)列的代碼如下：

createActionSequence : function(actionSpritePointer){
    
    var moveAction0 = cc.MoveBy(0.5, cc.p(cc.winSize.width/2, 0));
    var moveAction1 = cc.MoveBy(0.5, cc.p(0, cc.winSize.height/2));
    var moveAction2 = cc.MoveBy(0.5, cc.p(-cc.winSize.width/2, 0));
    var moveAction3 = cc.MoveBy(0.5, cc.p(0, -cc.winSize.height/2));
    var actionCallbackFunction = cc.CallFunc(this.actionCallbackFunction, this, actionSpritePointer);
    var actionFinishCallbackFunction = cc.CallFunc(this.actionFinishCallFunction, this, actionSpritePointer);
    
    var actionArray = [];
    actionArray.push(moveAction0);
    actionArray.push(actionCallbackFunction);
    actionArray.push(moveAction1);
    actionArray.push(actionCallbackFunction);
    actionArray.push(moveAction2);
    actionArray.push(actionCallbackFunction);
    actionArray.push(moveAction3);
    actionArray.push(actionFinishCallbackFunction);
    
    var actionSequence = cc.Sequence(actionArray);
    
    return actionSequence;
    
}

參數(shù) actionSpritePointer 要在創(chuàng)建時(shí)傳入要執(zhí)行這個(gè)動(dòng)作隊(duì)列的精靈，這樣，就能把這個(gè)精靈的指針傳入回調(diào)函數(shù)中。
創(chuàng)建動(dòng)作隊(duì)列并執(zhí)行的代碼如下：

    var actionSprite0 = new cc.Sprite("res/me.png");
    var actionSprite1 = new cc.Sprite("res/me.png");
    
    actionSprite0.setAnchorPoint(0, 0);
    actionSprite1.setAnchorPoint(1, 0);
    
    actionSprite0.x = 0;
    actionSprite0.y = 0;
    
    actionSprite1.x = cc.winSize.width/2;
    actionSprite1.y = 0;
    
    this.addChild(actionSprite0);
    this.addChild(actionSprite1);
    
    var actionSequence0 = this.createActionSequence(actionSprite0);
    var actionSequence1 = this.createActionSequence(actionSprite1);
    
    cc.log(typeof actionSequence0);
    
    actionSprite0.runAction(actionSequence0);
    actionSprite1.runAction(actionSequence1);

謝謝觀賞，如果有錯(cuò)誤，歡迎指正～