title: How to do a Tween in CraftyJS?
body: <p>Alright, I'm at my wits end and I can't get CraftyJS to do a tween.</p>
  
  <p>So what I wanna do is, everytime a Mushroom gets hit, I want to check if that mushroom has the component "Answer". If it exists, I will do nothing. Otherwise, I wanna display a big red box that fades away.</p>
  
  <pre><code>Crafty.c("Mushroom", {
          init: function() {
              this.addComponent("collision");
              this.collision();
              this.onhit("bullet",function(e) {
                  this.destroy();
                  e[0].obj.destroy();
                  if(!this.has("Answer")) {
                      Crafty.e("2D, Tween, color, canvas")
                      .attr({alpha: 1.0, x: 170, y: 100, w:300, h:100})
                      .color("red")
                      .bind("enterframe", function() { //How do i actually get the box to fade?
                          this.tween({alpha: 0.5, x: 170, y: 100}, 30);
                      });
                  }
              });
          }
  </code></pre>