好家伙 我這個上浮就跟放風箏一樣，只能下移埋地雷

fruitObj.prototype.draw?=?function(){

????for(var?i?=?0;?i?<?this.num;?i++){

????????if?(this.alive[i]?==?true){

????????????if?(this.l[i]?<?20){

????????????????this.l[i]+=this.speed[i]*0.3*dateTime;

????????????}else{

????????????????this.y[i]+=(this.speed[i]*0.4*dateTime);

????????????????

????????????}

????

????????????ctx2.drawImage(this.orange,?this.x[i]?-?this.l[i]*0.5,?this.y[i]?-?this.l[i]*0.5,?this.l[i],?this.l[i]?)

????

????????????//?檢測，y坐標改變alive狀態

????????????if?(this.y[i]?<?20){

????????????????this.alive?=?false;

????????????}

????????}

???

????}

}