实例演示字体图标的引入与显示与媒体查询(移动优先)

1.实例演示字体图标的引入

<!DOCTYPE html>
<html lang="zh-cn">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="./unicode.css">
    <link rel="stylesheet" href="class.css">
    <style>
        /* unicode */
        .iconfont.unicode {
            font-family: iconfont;
        }
        button {
            font-size: 2em;
            color: coral;
            transition: all .5s;
        }
        button:hover {
            font-size: 3em;
        }
    </style>
</head>
<body>
    <!-- 1.unicode -->
    <button class="iconfont unicode">&#xe697;添加用户</button>
    <button class="iconfont icon-shezhitianchong">设置</button>
</body>
</html>

2.媒体查询

指令：@media 默认screen即屏幕
属性：max-width min-width
操作符：and not onlu
书写顺序约定
1、移动端：从小到大
2、PC端：从大到小

<!DOCTYPE html>
<html lang="zh-cn">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <button class="btn sm">按钮1</button>
    <button class="btn md">按钮2</button>
    <button class="btn lg">按钮3</button>
    <style>
        html{
            font-size: 0.625rem;
        }
        .btn {
            background-color: coral;
            color: white;
            border: none;
            outline: none;
        }
        .btn:hover {
            cursor: pointer;
            opacity: .5;
            transition: all .3s;
        }
        .btn.sm {
            font-size: 1.2rem;
        }
        .btn.md {
            font-size: 1.6rem;
        }
        .btn.lg {
            font-size: 1.8rem;
        }
        /* 1.宽度小于375px,字号改为12px */
        @media (max-width: 375px) {
            html{
                font-size:12px;
            }
        }
        @media (min-width:600px) {
            html{
                font-size: 16px;
            }
        }
        @media (min-width:375px) and (max-width:600px) {
            html{
                font-size: 14px;
            }
        }
    </style>
</body>
</html>

1.实例演示字体图标的引入

2.媒体查询

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