浅谈利用缓存来优化HTML5 Canvas程序的性能

thisthis.cacheCtx.strokeStyle = this.color[j]; this.cacheCtx.arc(this.r , this.r , i , 0 , 2*Math.PI);

this.cacheCtx.stroke(); j++;

} this.cacheCtx.restore();

},

move:function(){ this.x += this.vx;

this.y += this.vy; if(this.x>(canvas.width-this.r)||this.x<this.r){

thisthis.x=this.x<this.r?this.r:(canvas.width-this.r); this.vx = -this.vx;

} if(this.y>(canvas.height-this.r)||this.y<this.r){

thisthis.y=this.y<this.r?this.r:(canvas.height-this.r); this.vy = -this.vy;