请你写一个动态爱心代码

好的，这是一个用HTML, CSS和JavaScript制作的动态爱心代码：

HTML:

<div class="heart">
  <span class="heart-shape"></span>
</div>

CSS:

.heart {
  width: 100px;
  height: 100px;
  position: relative;
  margin: 50px auto;
}

.heart-shape {
  width: 100%;
  height: 100%;
  background: #e60073;
  border-radius: 50% 50% 0;
  transform: rotate(45deg);
  position: absolute;
}

.heart-shape:before,
.heart-shape:after {
  content: "";
  width: 100%;;
  height: 100%;
  background: #e60073;
  border-radius: 50% 50% 0;
  position: absolute;
}

.heart-shape:before {
  top: -50%;
  left: 0;
}

.heart-shape:after {
  top: 0;
  left: -50%;
}

JavaScript:

var heart = document.querySelector('.heart');
var heartShape = document.querySelector('.heart-shape');

heart.addEventListener("click", function() {
  heartShape.style.animation = "beat 1s ease infinite";
});

这个代码会创造一个爱心形状的div，它会在点击时呈现心跳的动画效果。