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代码编辑器：

<style>
div {
    width: 100px;
    height: 100px;
    border: 1px solid black;
    margin: 10px;
    float: left;
    padding: 30px;
    text-align: center;
    background-color: lightgray;
}
p {
    background-color: white;
}
</style>
<h3>演示了 onmousemove, onmouseleave 和 onmouseout 的区别</h3>
<p> onmousemove 事件在鼠标移动到 div 元素上时触发</p>
<p> mouseleave 事件只在鼠标指针移出 div 元素时触发。 </p>
<p> onmouseout 事件在鼠标指针移出 div 元素及离开子元素（p 和 span）时触发</p>
<div onmousemove="myMoveFunction()">
  <p>onmousemove: <br> <span id="demo">鼠标移入和移出！</span></p>
</div>
<div onmouseleave="myLeaveFunction()">
  <p>onmouseleave: <br> <span id="demo2">鼠标移入和移出！</span></p>
</div>
<div onmouseout="myOutFunction()">
  <p>onmouseout: <br> <span id="demo3">鼠标移入和移出！</span></p>
</div>
<script>
x = 0;
y = 0;
z = 0;
function myMoveFunction() {
    document.getElementById("demo").innerHTML = z+=1;
}
function myLeaveFunction() {
    document.getElementById("demo2").innerHTML = x+=1;
}
function myOutFunction() {
    document.getElementById("demo3").innerHTML = y+=1;
}
</script>

运行结果：