<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
div{
height: 150px;
width: 150px;
background:gold;
}
</style>
</head>
<body>
<!--
onmousemove 鼠标在上面晃动就会一直加
onmousedown 鼠标点击一下就会加一
onmouseover 鼠标一放进去就加一
onmouseout 鼠标一拿出来就加一
-->
<div onmouseout="down()"></div>
</body>
<script>
function down() {
console.log("down") //每点击一下加一
}
</script>
</html>
原文：https://www.cnblogs.com/TKOPython/p/12823595.html