var momObj = function(){ this.x ;//坐標(biāo) this.y ; this.bigEye = new Image();//魚(yú)的眼睛 this.bigBody = new Image();//魚(yú)的身體 this.bigTail = new Image();//魚(yú)的尾巴}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);/*方法轉(zhuǎn)換畫(huà)布的用戶(hù)坐標(biāo)系統(tǒng)。平移，將畫(huà)布的坐標(biāo)原點(diǎn)向左右方向移動(dòng)x，向上下方向移動(dòng)y.canvas的默認(rèn)位置是在（0,0）*/ 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+30,-this.bigTail.height*0.5); ctx1.restore();}