应该是在调用ane.draw()出的问题，把他写在gameloop()中

因为没有过渡吧，这是（上）我的gameloop

function gameloop(){

window.requestAnimFrame(gameloop);//setInterval,setTimeout(),fps(frame per second)

var now = Date.now();//funny

deltaTime = now - lastTime;

lastTime = now;

if(deltaTime > 40)deltaTime = 40;

drawBackground();

ane.draw();

fruitMonitor();

fruit.draw();

ctx1.clearRect(0,0,canWidth,canHeight);

mom.draw();

momFruitsCollision();

baby.draw();

}