<!DOCTYPE html>
<html lang="en">
<head>
<script type="text/javascript" src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<meta charset="UTF-8">
<title>元素选择器</title>
</head>
<body>
<ul>
<li>
1
</li>
<li>
2
</li>
<li>
3
</li>
<li>
4
</li>
</ul>
<script type="text/javascript">
$(function(){
$("ul li").on("click",function(){
var ind = $(this).index();
alert(ind);
$("ul li").removeClass("current");
$(this).css("background-color","yellow");
})
}
</script>
</body>
</html>
