一:指令修饰符
二:v-bind操作class
案例:
<!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>
ul {
display: flex;
}
li {
margin-right: 10px;
padding: 5px;
}
a {
text-decoration: none;