<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>区别</title>
<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>
</head>
<body>
<h3>该实例演示了 onmousemove, onmouseenter 和 onmouseover 的不同。</h3>
<p> onmousemove 事件在鼠标移动到 div 元素上时触发。</p>
<p> mouseenter 事件中有在鼠标指针进入 div 元素时触发。 </p>
<p> onmouseover 事件在鼠标指针进入 div 元素时触发,在子元素上也会触发(p 和 span)。</p>
<div onmousemove="myMoveFunction()">
<p>onmousemove: <br> <span id="demo">鼠标移动到我这!</span></p>
</div>
<div onmouseenter="myEnterFunction()">
<p>onmouseenter: <br> <span id="demo2">标移动到我这!</span></p>
</div>
<div onmouseover="myOverFunction()">
<p>onmouseover: <br> <span id="demo3">标移动到我这!</span></p>
</div>
<script>
x = 0;
y = 0;
z = 0;
function myMoveFunction() {
document.getElementById("demo").innerHTML = z+=1;
}
function myEnterFunction() {
document.getElementById("demo2").innerHTML = x+=1;
}
function myOverFunction() {
document.getElementById("demo3").innerHTML = y+=1;
}
</script>
</body>
</html>
onmouseover 与 onmouseenter 唯一的区别是： onmouseenter 事件不支持冒泡。