不知道为什么一直不出来果实跪求

Question

var fruitObj = function(){ this.alive = []; 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; } 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) { 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 = 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) { sendFruit(); return; }}function sendFruit(){ for(var i=0;i<fruit.num;i++) { if(!fruit.alive[i]) { fruit.born(i);       //判断果实是否出现 return; } }}

Answer 1

你的draw的if（this.alive）里的alive是数组，无法满足的话是不能画的，目前就看到那里，你修改看看