<!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>
* {
margin: 0;
padding: 0;
}
ul,
li {
list-style: none;
}
li {
float: left;
width: 28px;
height: 28px;
background: url(images/star.gif);
}
</style>
</head>
<body>
<ul>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>
</body>
</html>
<script>
let oli = document.querySelectorAll("li");
var oUL = document.querySelector("ul");
//只能给Ul添加事件
oUL.onmousemove = function (evt) {
let e = evt || event;
for (let i = 0; i < oli.length; i++) {
if (e.pageX >= oli[0].offsetWidth * i) {//鼠标坐标若大于i个li判断
oli[i].style.background = "url(images/star.gif) 0 -28px";
} else {
oli[i].style.background = "url(images/star.gif) 0 0";
}
}
}
oUL.onclick = function () {
oUL.onmousemove = null;
}
</script>
