方法一:

将body和html得高度设置为100%,再设置div高度为100%

<!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>Document</title>
</head>
<body>
    <div class="box"></div>
</body>

</html>
<style>
    body, html {
        height: 100%
    }
    .box {
        width: 100%;
        height: 100%;
        background-color: red;
    }
</style>

方法二:

将要铺满全屏的元素脱离文档流

<!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>Document</title>
</head>
<body>
    <div class="box"></div>
</body>
<style>
    .box {
        width: 100%;
        height: 100%;
        position: fixed;
        background-color: red;
    }
</style>

方法三:

使用vh,vh相对视口高度

<!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>Document</title>
</head>
<body>
    <div class="box"></div>
</body>
<sytle>
    .box {
        width: 100vw;
        height: 100vh;
        background-color: red
    }
</style>

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