CSS div悬停可通过另一个拖动的div更改颜色

<div id="hoverDiv">悬停的div</div>
<div id="dragDiv">拖动的div</div>

#hoverDiv {
  width: 200px;
  height: 200px;
  background-color: blue;
  color: white;
  text-align: center;
  line-height: 200px;
}

#dragDiv {
  width: 100px;
  height: 100px;
  background-color: red;
  position: absolute;
  top: 50px;
  left: 50px;
  cursor: move;
}

var hoverDiv = document.getElementById("hoverDiv");
var dragDiv = document.getElementById("dragDiv");

dragDiv.addEventListener("mousemove", function(event) {
  hoverDiv.style.backgroundColor = "green";
});

dragDiv.addEventListener("mouseout", function(event) {
  hoverDiv.style.backgroundColor = "blue";
});