<!DOCTYPE html>
<html lang="en">
<head>
<title>Title</title>
<meta charset="UTF-8">
<!--<!– <script src="js_file01.js"></script>–> 尽量放后body前边-->
<style>
div{
width: 200px;
height: 100px;
background-color: #178cfa;
}
</style>
</head>
<body>
<div onmousedown="down1()" onmousemove="move1()" onmouseout="out1()" onmouseover="over1()">hello</div>
<script>
function down1() {
console.log("down")
}
function move1() {
console.log("move1")
}
function out1() {
console.log("out1")
}
function over1() {
console.log("over1")
}
</script>
</body>
</html>
原文：https://www.cnblogs.com/zxy01/p/13509820.html