var?fruitobj=function()
{
????this.alive?=[];//bool
????this.x?=[];
????this.y?=[];
????this.l?=[];
????this.spd?=[];
????this.orange?=?new?Image();
????this.blue?=?new?Image();
}
fruitobj.prototype.num?=?30;
fruitobj.prototype.init?=?function()
{
????for(var?i?=0;?i<?this.num;?i++)
????{
????????this.alive[i]?=?false;
????????this.x[i]?=?0;
????????this.y[i]?=?0;
????????this.spd[i]?=?Math.random()?*?0.01?+?0.005;//[0.005,0.015)
????????this.born(i);
????}
????this.orange.src?=?"./src/fruit.png";
????this.blue.src?=?"./src/blue.png";
}
fruitobj.prototype.draw?=function()
{
????for(var?i?=0;?i<?this.num;?i++)
????{
????????//draw
????????//find?an?ane,grow,flyup
????????if(this.alive[i])
????????{
?????????????????????if(this.l[i]?<=?14)
????????????{
?????????????????????this.l[i]?+=?this.spd[i]?*?deltaTime;
????????????}
????????????else
????????????{
?????????????????????this.y[i]?-=?this.spd[i]?*?7?*?deltaTime;
????????????}
????????????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]);
????????????if(this.y[i]?<?10)
????????????{
?????????????????????this.alive[i]=false;
????????????}
????????}
????}
}
fruitobj.prototype.born?=?function(i)
{
????var?aneID?=?Math.floor(Math.random()?*?ane.num);
????this.x[i]?=?ane.x[aneID];
????this.y[i]?=?canHeight?-?ane.len[aneID];
????this.l[i]?=?0;
????this.alive[i]?=?true;
}
function?fruitMonitor()
{
????var?num?=0;
????for(var?i?=?0;?i?<?fruit.num;?i++)
????{
????????if(fruit.alive[i])?num++;
????}
????if(num?<?15)
????{
????????//send?fruit
????????sendFruit();
????????return;
????}
}
function?sendFruit()
{
????for(var?i?=?0;?i?<?fruit.num;?i++)
????{
????????if(!fruit.alive[i])
????????{
????????????fruit.born(i);
????????????return;
????????}
????}
}

不循環(huán)呀? 大神求指點