dos

Public/static/js/common.js

@@ -155,11 +155,11 @@ Particle.prototype = {
         this.vy += this.gravity;
         this.y += this.vy;
         this.alpha -= 0.01;
-        // if (this.x <= -this.w || this.x >= screen.width ||
-        //     this.y >= screen.height ||
-        //     this.alpha <= 0) {
-        //     return false;
-        // }
+        if (this.x <= -this.w || this.x >= canvas.width ||
+            this.y >= canvas.height ||
+            this.alpha <= 0) {
+            return false;
+        }
         return true;
     },
     draw: function (c) {