请问为什么我的果实完全不会动，也不会变大变小飘起来，编译也没报错
//绘制果实
var fruitObj = function()
{
this.alive = [];//bool
this.x = [];
this.y = [];
this.l = [];
this.spd = [];
this.fruitType = [];
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.l[i] = 0;
this.spd[i] = Math.random() * 0.017 + 0.003; //[0.003,0.02)
this.fruitType[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,fly,up
if(this.alive[i])
{
if(this.fruitType[i] == "blue")
{
var pic = this.blue;
}
else
{
var pic = this.orange;
}
if(this.l[i] <= 14)
{
this.l[i] += this.spd[i] * deltaTime;
}
else
{
this.y[i] -= this.spd[i] * 7 * deltaTime;
}
ctx2.drawImage(pic, 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;
var ran = Math.random();
if(ran < 0.2)
{
this.fruitType[i] = "blue"; //orange,blue
}
else
{
this.fruitType[i] = "orange";
}
}
fruitObj.prototype.dead = function(i)
{
this.alive[i] = false;
}
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;
}
}
}
应该是代码有的地方打错了，这个代码是对的，你可以看一下