[ActionScript] 幾種物件撰寫方式

一般撰寫的方式：雖然沒有建構物件，但別忘了場景本身就是一個物件，所以下面的撰寫方式已經再使用物件了。

原始碼

1. var dataStr="jax"; 
2. var loadMc:MovieClip = createEmptyMovieClip("container", this.getNextHighestDepth()); 
3. loadMc._x = loadMc._y = 0; 
4. loadMc.visible = false; 
5.  
6. var mcLoader:MovieClipLoader = new MovieClipLoader(); 
7. mcLoader.addListener(this); 
8. mcLoader.loadClip("vodBlock.swf",loadMc); 
9.  
10. function onLoadInit(loadMc:MovieClip) { 
11.    loadMc._visible = false; 
12.    loadMc.text=this.dataStr; 
13. }     

var dataStr="jax";
var loadMc:MovieClip = createEmptyMovieClip("container", this.getNextHighestDepth());
loadMc._x = loadMc._y = 0;
loadMc.visible = false;

var mcLoader:MovieClipLoader = new MovieClipLoader();
mcLoader.addListener(this);
mcLoader.loadClip("vodBlock.swf",loadMc);

function onLoadInit(loadMc:MovieClip) {
    loadMc._visible = false;
    loadMc.text=this.dataStr;
}    

使用 JSON 的撰寫方式：如果只是單純的建立一個物件，下面這個寫法應該是最簡潔的，但這並不是一個很好 ActionScript 風格。

原始碼

1. var myObject = { 
2.    dataStr:"jax", 
3.    loadMc:null, 
4.    init:function(){ 
5.        this.loadMc= createEmptyMovieClip("container", this.getNextHighestDepth()); 
6.        this.loadMc._x = this.loadMc._y = 0; 
7.        this.loadMc.visible = false; 
8.  
9.        var mcLoader:MovieClipLoader = new MovieClipLoader(); 
10.        mcLoader.addListener(this); 
11.        mcLoader.loadClip("vodBlock.swf",this.loadMc); 
12.    }, 
13.    onLoadInit:function(loadMc:MovieClip) { 
14.        loadMc._visible = false; 
15.        loadMc.text=this.dataStr; 
16.    } 
17. }     
18.  
19. myObject.init();     

var myObject = {
    dataStr:"jax",
    loadMc:null,
    init:function(){
        this.loadMc= createEmptyMovieClip("container", this.getNextHighestDepth());
        this.loadMc._x = this.loadMc._y = 0;
        this.loadMc.visible = false;

        var mcLoader:MovieClipLoader = new MovieClipLoader();
        mcLoader.addListener(this);
        mcLoader.loadClip("vodBlock.swf",this.loadMc);
    },
    onLoadInit:function(loadMc:MovieClip) {
        loadMc._visible = false;
        loadMc.text=this.dataStr;
    }
}    
    
myObject.init();    

利用 Class 撰寫方式：這是 ActionScript 標準風格的撰寫方式，也比較正規一點。

原始碼

1. class MyClass{ 
2.    var dataStr:String; 
3.    var loadMc:MovieClip; 
4.  
5.    function MyClass(){ 
6.        this.dataStr="jax" 
7.        this.loadMc= createEmptyMovieClip("container", this.getNextHighestDepth()); 
8.        this.loadMc._x = container._y = 0; 
9.        this.loadMc.visible = false; 
10.  
11.        var mcLoader:MovieClipLoader = new MovieClipLoader(); 
12.        mcLoader.addListener(this); 
13.        mcLoader.loadClip("vodBlock.swf",this.loadMc);         
14.    } 
15.  
16.    function onLoadInit(loadMc:MovieClip) { 
17.        loadMc._visible = false; 
18.        loadMc.text=this.dataStr; 
19.    } 
20. }     
21. new MyClass();     

class MyClass{
    var dataStr:String;
    var loadMc:MovieClip;
    
    function MyClass(){
        this.dataStr="jax"
        this.loadMc= createEmptyMovieClip("container", this.getNextHighestDepth());
        this.loadMc._x = container._y = 0;
        this.loadMc.visible = false;

        var mcLoader:MovieClipLoader = new MovieClipLoader();
        mcLoader.addListener(this);
        mcLoader.loadClip("vodBlock.swf",this.loadMc);        
    }
    
    function onLoadInit(loadMc:MovieClip) {
        loadMc._visible = false;
        loadMc.text=this.dataStr;
    }
}    
new MyClass();    

延伸原生 Class 的撰寫方式：如果規劃的好這會是一個很省事的撰寫方式。

原始碼

1. class MyMovieClip extends MovieClip{ 
2.    var dataStr:String; 
3.  
4.    function MyMovieClip(){ 
5.        this.dataStr="jax" 
6.        this._x = this._y = 0; 
7.        this.visible = false; 
8.    } 
9.  
10.    function loadMovieClip(src:String) :MovieClip { 
11.        var mcLoader:MovieClipLoader = new MovieClipLoader(); 
12.        mcLoader.addListener(this); 
13.        mcLoader.loadClip(src,this);         
14.        return this; 
15.    } 
16.  
17.    function onLoadInit(mc:MovieClip) { 
18.        this = MyMovieClip(loadMc); 
19.        this._visible = false; 
20.        this.text=this.dataStr; 
21.    } 
22. }     
23.  
24. var loadMc:MyMovieClip = MyMovieClip( createEmptyMovieClip("container", this.getNextHighestDepth()) ); 
25. loadMc.loadMovieClip("vodBlock.swf"); 

class MyMovieClip extends MovieClip{
    var dataStr:String;
 
    function MyMovieClip(){
        this.dataStr="jax"
        this._x = this._y = 0;
        this.visible = false;
    }

    function loadMovieClip(src:String) :MovieClip {
        var mcLoader:MovieClipLoader = new MovieClipLoader();
        mcLoader.addListener(this);
        mcLoader.loadClip(src,this);        
        return this;
    }
    
    function onLoadInit(mc:MovieClip) {
        this = MyMovieClip(loadMc);
        this._visible = false;
        this.text=this.dataStr;
    }
}    

var loadMc:MyMovieClip = MyMovieClip( createEmptyMovieClip("container", this.getNextHighestDepth()) );
loadMc.loadMovieClip("vodBlock.swf");

物件的撰寫有幾個要點：

1. 搞清楚 this 到底是誰？這大概也是入門時最容易被弄到翻過來的問題之一
   
2. 物件的規劃，別寫了半天的『物件導向』跟寫『結構語言』沒什麼分別。