bgPic.onload = function drawBg(){
    
ctx2.drawImage(bgPic,0,0,canWidth,canHeight);
}
                
            ctx2.drawImage(bgPic,0,0,canWidth,canHeight);
}
如果,你跟着老师的打而且没有错误的话,老师在main.js里面的fruit = new fruitObj();下一行加个fruit.init();,果实就能出来了。
                
                    
                    2017-04-26
                
            ctx1 = can1.context();报错,context() is not a function.
我改成 ctx1 = can1.getContext(); 测试OK
                
            我改成 ctx1 = can1.getContext(); 测试OK
 
             
        












