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详解CSS `clear` 属性及其各个选项

article 2025/2/3 6:16:18

详解CSS `clear` 属性及其各个选项

- 1. `clear: left;`
- - 示例代码
- 2. `clear: right;`
- - 示例代码
- 3. `clear: both;`
- - 示例代码
- 4. `clear: none;`
- - 示例代码
- 总结

在CSS布局中，clear 属性是一个非常重要的工具，特别是在处理浮动元素时。本文将详细解释 clear 属性及其各个选项，并提供相应的示例代码，帮助你更好地理解和使用这个属性。

1. `clear: left;`

clear: left; 表示该元素的左侧不允许浮动元素。如果左侧有浮动元素，则该元素会移动到浮动元素的下方。

示例代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Clear Left Example</title>
    <style>
        .float-left {
            float: left;
            width: 100px;
            height: 100px;
            background-color: lightblue;
        }

        .clear-left {
            clear: left;
            background-color: lightgreen;
        }
    </style>
</head>
<body>
    <div class="float-left">Float Left</div>
    <div class="clear-left">Clear Left</div>
</body>
</html>

2. `clear: right;`

clear: right; 表示该元素的右侧不允许浮动元素。如果右侧有浮动元素，则该元素会移动到浮动元素的下方。

示例代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Clear Right Example</title>
    <style>
        .float-right {
            float: right;
            width: 100px;
            height: 100px;
            background-color: lightcoral;
        }

        .clear-right {
            clear: right;
            background-color: lightyellow;
        }
    </style>
</head>
<body>
    <div class="float-right">Float Right</div>
    <div class="clear-right">Clear Right</div>
</body>
</html>

3. `clear: both;`

clear: both; 表示该元素的左右两侧都不允许浮动元素。如果左右两侧都有浮动元素，则该元素会移动到所有浮动元素的下方。

示例代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Clear Both Example</title>
    <style>
        .float-left {
            float: left;
            width: 100px;
            height: 100px;
            background-color: lightblue;
        }

        .float-right {
            float: right;
            width: 100px;
            height: 100px;
            background-color: lightcoral;
        }

        .clear-both {
            clear: both;
            background-color: lightgray;
        }
    </style>
</head>
<body>
    <div class="float-left">Float Left</div>
    <div class="float-right">Float Right</div>
    <div class="clear-both">Clear Both</div>
</body>
</html>

4. `clear: none;`

clear: none; 是默认值，允许浮动元素出现在元素的左右两侧。

示例代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Clear None Example</title>
    <style>
        .float-left {
            float: left;
            width: 100px;
            height: 100px;
            background-color: lightblue;
        }

        .float-right {
            float: right;
            width: 100px;
            height: 100px;
            background-color: lightcoral;
        }

        .clear-none {
            clear: none;
            background-color: lightgray;
        }
    </style>
</head>
<body>
    <div class="float-left">Float Left</div>
    <div class="float-right">Float Right</div>
    <div class="clear-none">Clear None</div>
</body>
</html>