当前位置：首页 > news >正文

【移动WEB开发】rem适配布局

news 来源：原创 2025/6/6 17:22:37

1. rem基础

2.媒体查询

2.1 语法规范

2.2 媒体查询+rem

2.3 引入资源（理解）

3. less基础

3.1 维护css的弊端

3.2 less介绍

3.3 less变量

3.4 less编译

3.5 less嵌套

3.6 less运算

4. rem适配方案

4.1 rem实际开发

4.2 技术使用

4.3 rem+媒体查询+less

5. 苏宁网首页案例制作

6. rem适配方案2

1. rem基础

2.媒体查询

2.1 语法规范

        /* 媒体查询一般按照从大到小或从小到大的顺序 */
        /* 样式具有层叠性 */
        /* screen and 不能省略 */
        /* 数字后面必须跟单位,and后面要跟空格 */
        @media screen and (max-width:539px) {
            body {
                background-color: blue;
            }
        }

        @media screen and (min-width:540px) {
            body {
                background-color: green;
            }
        }

        @media screen and (min-width:970px) {
            body {
                background-color: red;
            }
        }

2.2 媒体查询+rem

        @media screen and (min-width:320px) {
            html {
                font-size: 50px;
            }
        }

        @media screen and (min-width:640px) {
            html {
                font-size: 100px;
            }
        }

        .top {
            height: 1rem;
            font-size: .5rem;
            background-color: green;
            color: #fff;
            text-align: center;
            line-height: 1rem;
        }

2.3 引入资源（理解）

    <!-- 媒体查询最好从小到大写 -->
    <!-- 引入资源就是针对不同屏幕尺寸,调用不同的css文件 -->
    <link rel="stylesheet" href="style320.css" media="screen and (min-width:320px)">
    <link rel="stylesheet" href="style640.css" media="screen and (min-width:640px)">

3. less基础

3.1 维护css的弊端

3.2 less介绍

3.3 less变量

3.4 less编译

3.5 less嵌套

3.6 less运算

除法运算要加小括号才能算

4. rem适配方案

4.1 rem实际开发

4.2 技术使用

4.3 rem+媒体查询+less

5. 苏宁网首页案例制作

将样式文件导入样式文件中

index.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <link rel="stylesheet" href="css/normalize.css">
    <link rel="stylesheet" href="css/index.css">
    <title>Document</title>
</head>

<body>
    <!-- 顶部搜索框 -->
    <div class="search-content">
        <a href="#" class="classify"></a>
        <div class="search">
            <form action="">
                <input type="search" value="厨卫保暖季">
            </form>
        </div>
        <a href="#" class="login">登录</a>
    </div>
    <!-- banner 部分 -->
    <div class="banner">
        <img src="upload/banner.gif" alt="">
    </div>
    <!-- 广告部分 -->
    <div class="ad">
        <a href="#"><img src="upload/ad1.gif" alt=""></a>
        <a href="#"><img src="upload/ad2.gif" alt=""></a>
        <a href="#"><img src="upload/ad3.gif" alt=""></a>
    </div>
    <!-- nav -->
    <nav>
        <a href="#"><img src="upload/nav1.png" alt=""><span>爆款手机</span></a>
        <a href="#"><img src="upload/nav1.png" alt=""><span>爆款手机</span></a>
        <a href="#"><img src="upload/nav1.png" alt=""><span>爆款手机</span></a>
        <a href="#"><img src="upload/nav1.png" alt=""><span>爆款手机</span></a>
        <a href="#"><img src="upload/nav1.png" alt=""><span>爆款手机</span></a>
        <a href="#"><img src="upload/nav1.png" alt=""><span>爆款手机</span></a>
        <a href="#"><img src="upload/nav1.png" alt=""><span>爆款手机</span></a>
        <a href="#"><img src="upload/nav1.png" alt=""><span>爆款手机</span></a>
        <a href="#"><img src="upload/nav1.png" alt=""><span>爆款手机</span></a>
        <a href="#"><img src="upload/nav1.png" alt=""><span>爆款手机</span></a>
    </nav>
</body>

</html>

common.less

// 设置常见屏幕尺寸，修改里面的html文字大小
a {
    text-decoration: none;
}

html {
    // pc端也可以打开
    font-size: 50px;
}

// 本次定义划分的份数为15
@no: 15;
@media screen and (min-width: 320px) {
    html {
        font-size: (320px / @no);
    }
}

@media screen and (min-width:360px) {
    html {
        font-size: (360px / @no);
    }
}

// 375 iphone 678
@media screen and (min-width:375px) {
    html {
        font-size: (375px / @no);
    }
}

@media screen and (min-width:384px) {
    html {
        font-size: (384px / @no);
    }
}

@media screen and (min-width:400px) {
    html {
        font-size: (400px / @no);
    }
}

@media screen and (min-width:414px) {
    html {
        font-size: (375px / @no);
    }
}

@media screen and (min-width:424px) {
    html {
        font-size: (424px / @no);
    }
}

@media screen and (min-width:480px) {
    html {
        font-size: (480x / @no);
    }
}

@media screen and (min-width:540px) {
    html {
        font-size: (540px / @no);
    }
}

@media screen and (min-width:720px) {
    html {
        font-size: (720px / @no);
    }
}

@media screen and (min-width:750px) {
    html {
        font-size: (750px / @no);
    }
}

index.less

// 将样式文件导入样式文件中
@import "common";

body {
    min-width: 320px;
    width: 15rem;
    margin: 0 auto;
    line-height: 1.5;
    font-family: Arial, Helvetica, sans-serif;
    background: #f2f2f2;
}

// search-content
@baseFont: 50rem;

.search-content {
    display: flex;
    position: fixed;
    top: 0;
    left: 50%;
    transform: translate(-50%);
    width: 15rem;
    height: (88rem / @baseFont);
    background-color: #ffcc01;

    .classify {
        width: (44 / @baseFont);
        height: (70 / @baseFont);
        background: url(../images/classify.png);
        background-size: (44 / @baseFont) (70 / @baseFont);
        margin: (11 / @baseFont) (25 / @baseFont) (7 / @baseFont) (24 / @baseFont);
    }

    .search {
        flex: 1;

        input {
            // 去掉输入时的边框效果
            outline: none;
            width: 100%;
            border: 0;
            height: (66 / @baseFont);
            border-radius: (33 / @baseFont);
            background-color: #fff2cc;
            margin-top: (12 / @baseFont);
            font-size: (25 / @baseFont);
            color: #757575;
            padding-left: (55 / @baseFont);
        }
    }

    .login {
        width: (75 / @baseFont);
        height: (70 / @baseFont);
        margin: (10 / @baseFont);
        font-size: (25 / @baseFont);
        text-align: center;
        color: #fff;
        line-height: (70 / @baseFont);
    }
}

// banner
.banner {
    width: (750 / @baseFont);
    height: (368 / @baseFont);

    img {
        width: 100%;
        height: 100%;
    }
}

// ad
.ad {
    display: flex;

    a {
        flex: 1;

        img {
            width: 100%;
        }
    }
}

// nav
nav {
    width: (750 / @baseFont);

    a {
        float: left;
        width: (150 / @baseFont);
        height: (140 / @baseFont);
        text-align: center;

        img {
            display: block;
            width: (82 / @baseFont);
            height: (82 / @baseFont);
            margin: (10 / @baseFont) auto 0;
        }

        span {
            display: block;
            font-size: (25 / @baseFont);
            color: #333;
            margin-top: 5px;
        }
    }
}

6. rem适配方案2

flexible.js + rem

插件 cssrem 可以将px转换成rem；

这个插件默认的html文字大小 cssroot 16px；

在设置中搜索设置 cssroot ，将工作区的font size 设置为想要的。

index.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, user-scalable=no,initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">

    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <link rel="stylesheet" href="css/normalize.css">
    <link rel="stylesheet" href="css/index.css">
    <!-- 引入我们的flexible.js 文件 -->
    <script src="js/flexible.js"></script>
    <title>Document</title>
</head>

<body>
    <div class="search-content">
        <a href="#" class="classify"></a>
        <div class="search">
            <form action="">
                <input type="search" value="rem适配方案2很开心哦">
            </form>
        </div>
        <a href="#" class="login">登录</a>
    </div>
</body>

</html>

index.css

body {
    min-width: 320px;
    max-width: 750px;
    /* flexible 给我们划分了 10 等份 */
    width: 10rem;
    margin: 0 auto;
    line-height: 1.5;
    font-family: Arial, Helvetica;
    background: #f2f2f2;

}

a {
    text-decoration: none;
    font-size: .333333rem;
}


/* 这个插件默认的html文字大小 cssroot  16px */


/* 
img {
    width: 5.125rem;
    height: 4rem;
    width: 1rem;
    width: 1.093333rem;
    height: 1rem;
} */


/* 如果我们的屏幕超过了 750px  那么我们就按照 750设计稿来走 不会让我们页面超过750px */

@media screen and (min-width: 750px) {
    html {
        font-size: 75px !important;
    }
}


/* search-content */

.search-content {
    display: flex;
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 10rem;
    height: 1.173333rem;
    background-color: #FFC001;
}

.classify {
    width: .586667rem;
    height: .933333rem;
    margin: .146667rem .333333rem .133333rem;
    background: url(../images/classify.png) no-repeat;
    background-size: .586667rem .933333rem;
}

.search {
    flex: 1;
}

.search input {
    outline: none;
    border: 0;
    width: 100%;
    height: .88rem;
    font-size: .333333rem;
    background-color: #FFF2CC;
    margin-top: .133333rem;
    border-radius: .44rem;
    color: #757575;
    padding-left: .733333rem;
}

.login {
    width: 1rem;
    height: .933333rem;
    margin: .133333rem;
    color: #fff;
    text-align: center;
    line-height: .933333rem;
    font-size: .333333rem;
}