search
HomeWeb Front-endHTML Tutorialflexbox 伸缩布局盒 - HappyForEverIsaDream

Flexbox(伸缩布局盒) 是 CSS3 中一个新的布局模式,为了现代网络中更为复杂的网页需求而设计。

Flexbox 由 伸缩容器 和 伸缩项目 组成。通过设置元素的 display 属性为    flex  或  inline-flex     可以得到一个伸缩容器

            设置为flex的容器被渲染为一个块级元素,而设置为inline-flex的容器则渲染为一个行内元素。

例如:此处将 类名为   flex-container   的元素设置为伸缩容器

.flex-container {
display-webkit-flex;
displayflex;
}

伸缩容器中的每一个子元素都是一个伸缩项目。伸缩项目可以是任意数量的。伸缩容器外和伸缩项目内的一切元素都不受影响。

简单地说,Flexbox 定义了伸缩容器内伸缩项目该如何布局。

 

Flex Lines 伸缩行       

伸缩项目沿着伸缩容器内的一个 伸缩行 定位。通常每个伸缩容器只有一个伸缩行。  默认伸缩行从左往右

例子:

<span style="color: #008080;"> 1</span> <span style="color: #800000;"><div class="flex-container">
<span style="color: #008080;"> 2</span> <span style="color: #800000;"><div class="flex-item">flex item 1</div>
</span><span style="color: #008080;"> 3</span> <span style="color: #800000;"><div class="flex-item">flex item 2</div>
</span><span style="color: #008080;"> 4</span> <span style="color: #800000;"></span>
</div>
</span><span style="color: #008080;"> 5</span> 
<span style="color: #008080;"> 6</span> <span style="color: #800000;">样式:
</span><span style="color: #008080;"> 7</span> 
<span style="color: #008080;"> 8</span> <span style="color: #800000;">.flex-container </span>{
<span style="color: #008080;"> 9</span> <span style="color: #ff0000;">display</span>:<span style="color: #0000ff;"> -webkit-flex</span>;
<span style="color: #008080;">10</span> <span style="color: #ff0000;">display</span>:<span style="color: #0000ff;"> flex</span>;
<span style="color: #008080;">11</span> <span style="color: #ff0000;">width</span>:<span style="color: #0000ff;"> 300px</span>;
<span style="color: #008080;">12</span> <span style="color: #ff0000;">height</span>:<span style="color: #0000ff;"> 240px</span>;
<span style="color: #008080;">13</span> <span style="color: #ff0000;">background-color</span>:<span style="color: #0000ff;"> Silver</span>;
<span style="color: #008080;">14</span> }
<span style="color: #008080;">15</span> 
<span style="color: #008080;">16</span> <span style="color: #800000;">.flex-item </span>{
<span style="color: #008080;">17</span> <span style="color: #ff0000;">background-color</span>:<span style="color: #0000ff;"> DeepSkyBlue</span>;
<span style="color: #008080;">18</span> <span style="color: #ff0000;">width</span>:<span style="color: #0000ff;"> 100px</span>;
<span style="color: #008080;">19</span> <span style="color: #ff0000;">height</span>:<span style="color: #0000ff;"> 100px</span>;
<span style="color: #008080;">20</span> <span style="color: #ff0000;">margin</span>:<span style="color: #0000ff;"> 5px</span>;
<span style="color: #008080;">21</span> }
View Code

 

效果图:

再加

<div class="flex-item">flex item 3</div>
<div class="flex-item">flex item 4</div><br><br>伸缩项目的宽度超过了 伸缩容器的宽度,伸缩容器的宽度不会改变,伸缩项目的宽度减小<br><br><br><br>
<span style="color: #008080;"> 1</span> <span style="color: #800000;"><div class="flex-container">
<span style="color: #008080;"> 2</span> <span style="color: #800000;"><div class="flex-item">flex item 1</div>
</span><span style="color: #008080;"> 3</span> <span style="color: #800000;"><div class="flex-item">flex item 2</div>
</span><span style="color: #008080;"> 4</span> <span style="color: #800000;"></span>
</div>
</span><span style="color: #008080;"> 5</span> 
<span style="color: #008080;"> 6</span> 
<span style="color: #008080;"> 7</span> <span style="color: #800000;">CSS样式
</span><span style="color: #008080;"> 8</span> <span style="color: #800000;">.flex-container </span>{
<span style="color: #008080;"> 9</span> <span style="color: #ff0000;">   direction</span>:<span style="color: #0000ff;"> rtl</span>;
<span style="color: #008080;">10</span> <span style="color: #ff0000;">    display</span>:<span style="color: #0000ff;"> -webkit-flex</span>;
<span style="color: #008080;">11</span> <span style="color: #ff0000;">    display</span>:<span style="color: #0000ff;"> flex</span>;
<span style="color: #008080;">12</span> <span style="color: #ff0000;">    width</span>:<span style="color: #0000ff;"> 300px</span>;
<span style="color: #008080;">13</span> <span style="color: #ff0000;">    height</span>:<span style="color: #0000ff;"> 240px</span>;
<span style="color: #008080;">14</span> <span style="color: #ff0000;">    background-color</span>:<span style="color: #0000ff;"> Silver</span>;
<span style="color: #008080;">15</span>     
<span style="color: #008080;">16</span> }
<span style="color: #008080;">17</span> 
<span style="color: #008080;">18</span> <span style="color: #800000;">.flex-item </span>{
<span style="color: #008080;">19</span> <span style="color: #ff0000;">    background-color</span>:<span style="color: #0000ff;"> DeepSkyBlue</span>;
<span style="color: #008080;">20</span> <span style="color: #ff0000;">    width</span>:<span style="color: #0000ff;"> 100px</span>;
<span style="color: #008080;">21</span> <span style="color: #ff0000;">    height</span>:<span style="color: #0000ff;"> 100px</span>;
<span style="color: #008080;">22</span> <span style="color: #ff0000;">    margin</span>:<span style="color: #0000ff;"> 5px</span>;
<span style="color: #008080;">23</span> }
View Code

效果:

伸缩行从右往左,文字也从右往左

 

 

为了描述抽象的书写模式,Flexbox 使用 主轴 和 侧轴的概念。伸缩行跟随主轴。侧轴则垂直于主轴。

flex-direction 伸缩流的方向

默认值  row   

再次提醒,默认是从左至右,从上到下。其他的值如下:

  • row-reverse: 主轴起点和主轴终点交换。如果书写模式是从左至右,伸缩项目则是从左往右显示。
  • column: 主轴和侧轴交换。如果书写系统是垂直的,那么伸缩项目也是垂直显示的。
  • column-reverse: 和 column 一样,但是方向相反。

 

justify-content 主轴对齐

 

用于调整主轴上伸缩项目的位置。可能的值为:

  • flex-start (默认)
  • flex-end
  • center
  • space-between
  • space-around

 

 align-items 侧轴对齐

调整伸缩项目在侧轴上的定位方式。可能的值有:

  • flex-start (默认)
  • flex-end
  • center
  • baseline
  • stretch

 

flex-wrap 伸缩行换行

为伸缩容器创建多个伸缩行。这个属性接受以下值:

  • nowrap (默认)
  • wrap
  • wrap-reverse

 

align-content 堆栈伸缩行

它对齐的是伸缩行,它接受的值:

  • stretch (默认)
  • flex-start
  • flex-end
  • center
  • space-between
  • space-around

 

flex-flow 伸缩方向与换行    是flex-directionflex-wrap的缩写。

 

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
HTML as a Markup Language: Its Function and PurposeHTML as a Markup Language: Its Function and PurposeApr 22, 2025 am 12:02 AM

The function of HTML is to define the structure and content of a web page, and its purpose is to provide a standardized way to display information. 1) HTML organizes various parts of the web page through tags and attributes, such as titles and paragraphs. 2) It supports the separation of content and performance and improves maintenance efficiency. 3) HTML is extensible, allowing custom tags to enhance SEO.

The Future of HTML, CSS, and JavaScript: Web Development TrendsThe Future of HTML, CSS, and JavaScript: Web Development TrendsApr 19, 2025 am 12:02 AM

The future trends of HTML are semantics and web components, the future trends of CSS are CSS-in-JS and CSSHoudini, and the future trends of JavaScript are WebAssembly and Serverless. 1. HTML semantics improve accessibility and SEO effects, and Web components improve development efficiency, but attention should be paid to browser compatibility. 2. CSS-in-JS enhances style management flexibility but may increase file size. CSSHoudini allows direct operation of CSS rendering. 3.WebAssembly optimizes browser application performance but has a steep learning curve, and Serverless simplifies development but requires optimization of cold start problems.

HTML: The Structure, CSS: The Style, JavaScript: The BehaviorHTML: The Structure, CSS: The Style, JavaScript: The BehaviorApr 18, 2025 am 12:09 AM

The roles of HTML, CSS and JavaScript in web development are: 1. HTML defines the web page structure, 2. CSS controls the web page style, and 3. JavaScript adds dynamic behavior. Together, they build the framework, aesthetics and interactivity of modern websites.

The Future of HTML: Evolution and Trends in Web DesignThe Future of HTML: Evolution and Trends in Web DesignApr 17, 2025 am 12:12 AM

The future of HTML is full of infinite possibilities. 1) New features and standards will include more semantic tags and the popularity of WebComponents. 2) The web design trend will continue to develop towards responsive and accessible design. 3) Performance optimization will improve the user experience through responsive image loading and lazy loading technologies.

HTML vs. CSS vs. JavaScript: A Comparative OverviewHTML vs. CSS vs. JavaScript: A Comparative OverviewApr 16, 2025 am 12:04 AM

The roles of HTML, CSS and JavaScript in web development are: HTML is responsible for content structure, CSS is responsible for style, and JavaScript is responsible for dynamic behavior. 1. HTML defines the web page structure and content through tags to ensure semantics. 2. CSS controls the web page style through selectors and attributes to make it beautiful and easy to read. 3. JavaScript controls web page behavior through scripts to achieve dynamic and interactive functions.

HTML: Is It a Programming Language or Something Else?HTML: Is It a Programming Language or Something Else?Apr 15, 2025 am 12:13 AM

HTMLisnotaprogramminglanguage;itisamarkuplanguage.1)HTMLstructuresandformatswebcontentusingtags.2)ItworkswithCSSforstylingandJavaScriptforinteractivity,enhancingwebdevelopment.

HTML: Building the Structure of Web PagesHTML: Building the Structure of Web PagesApr 14, 2025 am 12:14 AM

HTML is the cornerstone of building web page structure. 1. HTML defines the content structure and semantics, and uses, etc. tags. 2. Provide semantic markers, such as, etc., to improve SEO effect. 3. To realize user interaction through tags, pay attention to form verification. 4. Use advanced elements such as, combined with JavaScript to achieve dynamic effects. 5. Common errors include unclosed labels and unquoted attribute values, and verification tools are required. 6. Optimization strategies include reducing HTTP requests, compressing HTML, using semantic tags, etc.

From Text to Websites: The Power of HTMLFrom Text to Websites: The Power of HTMLApr 13, 2025 am 12:07 AM

HTML is a language used to build web pages, defining web page structure and content through tags and attributes. 1) HTML organizes document structure through tags, such as,. 2) The browser parses HTML to build the DOM and renders the web page. 3) New features of HTML5, such as, enhance multimedia functions. 4) Common errors include unclosed labels and unquoted attribute values. 5) Optimization suggestions include using semantic tags and reducing file size.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

SecLists

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

WebStorm Mac version

WebStorm Mac version

Useful JavaScript development tools

Atom editor mac version download

Atom editor mac version download

The most popular open source editor

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function

DVWA

DVWA

Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software