var fruitObj=function()
{
this.alive=[];//bool
this.x=[];
this.y=[];
this.orange=new Image();
this.blue=new Image();
}
fruitObj.prototype.num=30;
fruitObj.prototype.init=function()
{
console.log("init");
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.jpg";
this.blue.src="./src/blue.jpg"
}
fruitObj.prototype.draw=function()
{
console.log("draw");
for(var i=0;i<this.num;i++)
{
//draw,find an ane,grow,fly up
ctx2.drawImage(this.orange,this.x[i]-this.orange.width*0.5,this.y[i]-this.orange.height*0.5);//果实没出现，提示这里有问题
}
}
fruitObj.prototype.update=function()
{
var num=0;
for(var i=0;i<this.num;i++)
if(this.alive[i]) num++;
}
fruitObj.prototype.born=function(i)
{
console.log("born");
var aneID=Math.floor(Math.random()*ane.num);
this.x[i]=ane.x[aneID];
this.y[i]=canHeight-ane.len[aneID];
}
请问是什么原因呀
