text: var haloObj=function(){
      this.x=[];
      this.y=[];
      this.alive=[];
      this.r=[];
  }
  
  haloObj.prototype.num=5;
  // 初始化
  haloObj.prototype.init=function(){
      console.log(433);
      for(var i=0;i<this.num;i++){
          this.x[i]=0;
          this.y[i]=0;
          this.alive[i]=false;
          this.r[i]=0;
      };
  };
  
  
  // 绘制
  haloObj.prototype.draw=function(){
      ctx1.save();
      ctx1.lineWidth=10;
      ctx1.shadowBlur=10;
      ctx1.shadowColor='raba(255,215,0,1)';
  
      for(var i=0;i<this.num;i++){
          if(this.alive[i]){
              this.r[i]+=deltaTime*0.05;
              if(this.r[i]>50){
                  this.alive[i]=false;
                  break;
              }
              var alpha=1-this.r[i]/50;
              ctx1.beginPath();
              ctx1.arc(this.x[i],this.y[i],this.r[i],0,Math.PI*2);
              ctx1.closePath();
              ctx1.strokeStyle=`rgba(255,215,0,${alpha})`;
              ctx1.stroke();
          }
      }
      ctx1.restore();
  }
  
  
  
  haloObj.prototype.born=function(x,y){
      for(var i=0;i<this.num;i++){
          if(!this.alive[i]){
              this.x[i]=x;
              this.y[i]=y;
              this.alive[i]=true;
              this.r[i]=10;
              return;
          }
      }
  }
  