<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
div {
100px;
height: 30px;
background: red;
margin: 10px;
}
</style>
<script>
window.onload = function() {
var oDiv = document.getElementsByTagName('div'); //获取所有的div
for (let i = 0; i < oDiv.length; i++) { //循环出所有的div
oDiv[i].time = null; //给每个div加一个定时器。解决：单个定时器，出现的问题
oDiv[i].onmouseover = function() {
starMove(this, 400);
};
oDiv[i].onmouseout = function() {
starMove(this, 100)
}
}
}
function starMove(obj, iTarget) {
clearInterval(obj.time); //停止每个div的定时器
obj.time = setInterval(function() {
var speed = (iTarget - obj.offsetWidth) / 6; //div的运行速度
speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed); //速度值的上下取整
if (obj.offsetWidth == iTarget) { //判断div的宽度是否等于目标点
clearInterval(obj.time); //如果等于目标点就清除定时器
} else {
//反之
obj.style.width = obj.offsetWidth + speed + 'px';
}
}, 30)
}
</script>
</head>
<body>
<div></div>
<div></div>
<div></div>
</body>
</html>