• 用一個類來創(chuàng)建工廠或?qū)嵗?/li>

    /**
     * 矢量圖工廠
     */
    function ShapeFactory(name)
    {
        var shape;
    
        switch(name)
        {
            case 'rect':
                shape = new Rect()
                break
    
            case 'circle':
                shape = new Circle()
                break
    
            case 'line':
                shape = new Line()
                break
    
            case 'arrow':
                shape = new Arrow()
                break
        }
    
        return shape;
    }
    
    
    /**
     * 位圖工廠
     */
    function BitmapFactory(name)
    {
        var bitmap;
    
        switch(name)
        {
            case 'rect':
                bitmap = new Rect()
                break
    
            case 'circle':
                bitmap = new Circle()
                break
    
            case 'line':
                bitmap = new Line()
                break
    
            case 'arrow':
                bitmap = new Arrow()
                break
        }
    
        return shape;
    }
    
    
    /**
     * 抽象工廠
     */
    function DrawFactory(name,type)
    {
        var factory;
    
        switch(name)
        {
            case 'shape':
                factory = new ShapeFactory(type)
                break
    
            case 'bitmap':
                factory = new BitmapFactory(type)
                break
        }
    
        return shape;
    }
    
    
    /**
     * 應用
     */
    var rect = new DrawFactory('shape','rect')

抽象工廠