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                            ## Canvas圖片繪制
~~~
var img = new Image();
img.src = "logo.png";
//imgde的加載需要一段時間  一定要在圖像加載完成后的回調中繪制圖像
img.onload = function() {
    //在(0,0)點處繪制img圖像  
    ctx.drawImage(img, 0, 0);
    //在(0,0)點處繪制img圖像,縮放成100*100
    //ctx.drawImage(img, 0, 0, 100, 100);
    //獲取img圖像的(0,0)點處的40*40區域，繪制在(100,100)點處，縮放成80*80
    //ctx.drawImage(img,0,0,40,40,100,100,80,80);
}
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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