一、vw和vh基本使用

效果:

代码:

<!DOCTYPE html>
<html lang="en">
<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>体验vw和vh</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        .box {
            width: 50vw;
            height: 30vw;
            background-color: pink;
        }
        .box {
            width: 50vh;
            height: 30vh;
            background-color: #ccc;
        }
    </style>
</head>
<body>
    <div class="box"></div>
</body>
</html>

二、vw和vh布局流程

根据设计稿确定1vw尺寸
px单位转换成vw单位尺寸

效果展示:

代码:

html代码段:

<!DOCTYPE html>
<html lang="en">
<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>vw适配</title>
    <link rel="stylesheet" href="./demo.css">
</head>
<body>
    <div class="box"></div>
</body>
</html>

less代码段:

* {
    margin: 0;
    padding: 0;
}

// .box {
//     // width: 68px;
//     // 68 / 3.75
//     width: (68 / 3.75vw);
//     height: (29 / 3.75vw);
//     background-color: pink;
// }

.box {
    width: (68 / 6.67vh);
    height: (29 / 6.67vh);
    background-color: #ccc;
}

css代码段:

* {
  margin: 0;
  padding: 0;
}
.box {
  width: 10.19490255vh;
  height: 4.34782609vh;
  background-color: #ccc;
}

三、vh布局弊端

vh是相对视口高度计算尺寸, 需要考虑全面屏，视口高度尺寸偏大

效果及代码:

html:

<!DOCTYPE html>
<html lang="en">
<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>vh</title>
    <link rel="stylesheet" href="./demo.css">
</head>
<body>
    <div class="box"></div>
</body>
</html>

less:

* {
    margin: 0;
    padding: 0;
}

.box {
    // 宽度用vw,高度用vh
    // 68 * 29
    width: (29 / 3.75vw);
    height: (29 / 6.67vh);
    background-color: pink;
}

css:

* {
  margin: 0;
  padding: 0;
}
.box {
  width: 7.73333333vw;
  height: 4.34782609vh;
  background-color: pink;
}

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