看了兩遍視頻了 ?代碼也沒錯誤 ?大魚就是顯示不出來是怎么了？

var momObj=function()
{
?? ?this.x;
?? ?this.y;
?? ?this.bigEye=new Image();
?? ?this.bigBody=new Image();
?? ?this.bigTail=new Image();
}
momObj.prototype.init=function()
{
?? ?this.x=canWidth*0.5;
?? ?this.y=canHeight*0.5;
?? ?this.bigEye.src="./src/bigEye0.png";
?? ?this.bigBody.src="./src/bigSwim0.png";
?? ?this.bigTail.src="./src/bigTail0.png";
}
momObj.prototype.draw=function()
{
?? ?ctx1.save();
?? ?ctx1.translate(this.x,this.y);
?? ?ctx1.drawImage(this.bigEye,-this.bigEye.width*0.5,-this.bigEye.height*0.5);
?? ?ctx1.drawImage(this.bigBody,-this.bigBody.width*0.5,-this.bigBody.height*0.5);
?? ?ctx1.drawImage(this.bigTail,-this.bigTail.width*0.5,-this.bigTail.height*0.5);
?? ?ctx1.restore();
}