function?gameloop(){
?window.requestAnimFrame(gameloop);//當(dāng)前繪制完后?根據(jù)機器的性能來繪制下一針
?var?now=Date.now();
?deltaTime=now-lastTime;
?lastTime=now;
?drawBackground();
?ane.draw();
?fruit.draw();
?}
fruitObj.prototype.draw=function(){
?for(var?i=0;?i<this.num;i++){
??if(deltaTime>100){document.getElementById("tc").innerHTML=deltaTime;}
??}
?}