外部图标库引用地址：
font awesome 图标库：<script src="https://kit.fontawesome.com/5c8afc9e87.js" crossorigin="ano nymous"></script>
bootstrap 图标库：<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1. 5.0/font/bootstrap-icons.css">
谷歌图标库： <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
实例代码：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="https://kit.fontawesome.com/5c8afc9e87.js" crossorigin="anonymous"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.5.0/font/bootstrap-icons.css">
<link href="https://fonts.googleapis.com/icon?family=Material+Icons"
rel="stylesheet">
<style>
i{
color:red;
font-size:30px;
}
span{
color:red;
font:30px;
}
</style>
</head>
<body>
<h1>使用外部图标库</h1>
<h2>Font Awesome 图标</h2>
<i class="fas fa-angle-double-down"></i>
<i class="fas fa-angle-double-left"></i>
<i class="fas fa-angle-double-right"></i>
<i class="fas fa-angle-double-up"></i>
<h2>Bootstrap 图标</h2>
<i class="bi bi-alarm"></i>
<i class="bi bi-alarm-fill"></i>
<i class="bi bi-bank"></i>
<i class="bi bi-bank2"></i>
<h2>Google 图标</h2>
<span class="material-icons">build</span>
<span class="material-icons">search</span>
<span class="material-icons">favorite</span>
<span class="material-icons">shopping_cart</span>
</body>
</html>
运行效果：
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