果实不显示

var fruitObj = function()

{

this.alive = [];    //bool

this.x = [];

this.y = [];

this.l = [];

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] = true;

this.x[i] = 0;

this.y[i] = 0;

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, fly up

if(this.l[i] <= 14)

{

this.l[i] += 0.01 * deltaTime;

}

else

{

this.y[i] -= 0.07 * 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]);

}

}

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;

}

fruitObj.prototype.update = function()

{

var num = 0;

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

{

if(this.alive[i]) num++;

}

}