如何使用Javascript/AngularJs将按钮放置在图像上特定的(x，y)位置

<div id="container">
  <img src="image.jpg" id="image">
  <button id="button">按钮</button>
</div>

#container {
  position: relative;
}

#image {
  position: absolute;
  top: 0;
  left: 0;
}

#button {
  position: absolute;
}

var button = document.getElementById("button");
button.style.left = x + "px";
button.style.top = y + "px";