一、记录下几种盒子居中的方法:
1.0、margin固定宽高居中;
2.0、负margin居中;
3.0、绝对定位居中;
4.0、table-cell居中;
5.0、flex居中;
6.0、transform居中;
7.0、不确定宽高居中(绝对定位百分数);
8.0、button居中。
二、代码演示(html使用同一个Demo):
html Demo:
<span style="color: #0000ff;"><span style="color: #800000;">body</span><span style="color: #0000ff;">></span> <span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">id</span><span style="color: #0000ff;">="container"</span><span style="color: #0000ff;">></span> <span style="color: #0000ff;"><span style="color: #800000;">div </span><span style="color: #ff0000;">id</span><span style="color: #0000ff;">="box"</span><span style="color: #0000ff;">></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span> <span style="color: #0000ff;"></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span> <span style="color: #0000ff;"></span><span style="color: #800000;">body</span><span style="color: #0000ff;">></span></span></span></span>
1.0、margin固定宽高居中(演示)
这种定位方法纯粹是靠宽高和margin拼出来的,不是很灵活。
CSS:
<span style="color: #800000;">#container </span>{<span style="color: #ff0000;"> width</span>:<span style="color: #0000ff;"> 600px</span>;<span style="color: #ff0000;"> height</span>:<span style="color: #0000ff;"> 500px</span>;<span style="color: #ff0000;"> border</span>:<span style="color: #0000ff;"> 1px solid #000</span>;<span style="color: #ff0000;"> margin</span>:<span style="color: #0000ff;"> auto</span>; }<span style="color: #800000;"> #box </span>{<span style="color: #ff0000;"> width</span>:<span style="color: #0000ff;"> 200px</span>;<span style="color: #ff0000;"> height</span>:<span style="color: #0000ff;"> 200px</span>;<span style="color: #ff0000;"> margin</span>:<span style="color: #0000ff;"> 150px 200px</span>;<span style="color: #ff0000;"> background-color</span>:<span style="color: #0000ff;"> #0ff</span>; }
2.0、负margin居中(演示)
利用负的margin来进行居中,需要知道固定宽高,限制比较大。
CSS:
<span style="color: #800000;">#container </span>{<span style="color: #ff0000;"> position</span>:<span style="color: #0000ff;"> relative</span>;<span style="color: #ff0000;"> width</span>:<span style="color: #0000ff;"> 600px</span>;<span style="color: #ff0000;"> height</span>:<span style="color: #0000ff;"> 500px</span>;<span style="color: #ff0000;"> border</span>:<span style="color: #0000ff;"> 1px solid #000</span>;<span style="color: #ff0000;"> margin</span>:<span style="color: #0000ff;"> auto</span>; }<span style="color: #800000;"> #box </span>{<span style="color: #ff0000;"> position</span>:<span style="color: #0000ff;"> absolute</span>;<span style="color: #ff0000;"> width</span>:<span style="color: #0000ff;"> 200px</span>;<span style="color: #ff0000;"> height</span>:<span style="color: #0000ff;"> 200px</span>;<span style="color: #ff0000;"> left</span>:<span style="color: #0000ff;"> 50%</span>;<span style="color: #ff0000;"> top</span>:<span style="color: #0000ff;"> 50%</span>;<span style="color: #ff0000;"> margin</span>:<span style="color: #0000ff;"> -100px -100px</span>;<span style="color: #ff0000;"> background-color</span>:<span style="color: #0000ff;"> #0ff</span>; }
3.0、绝对定位居中(演示)
利用绝对定位居中,非常常用的一种方法。
CSS:
<span style="color: #800000;">#container </span>{<span style="color: #ff0000;"> position</span>:<span style="color: #0000ff;"> relative</span>;<span style="color: #ff0000;"> width</span>:<span style="color: #0000ff;"> 600px</span>;<span style="color: #ff0000;"> height</span>:<span style="color: #0000ff;"> 500px</span>;<span style="color: #ff0000;"> border</span>:<span style="color: #0000ff;"> 1px solid #000</span>;<span style="color: #ff0000;"> margin</span>:<span style="color: #0000ff;"> auto</span>; }<span style="color: #800000;"> #box </span>{<span style="color: #ff0000;"> position</span>:<span style="color: #0000ff;"> absolute</span>;<span style="color: #ff0000;"> width</span>:<span style="color: #0000ff;"> 200px</span>;<span style="color: #ff0000;"> height</span>:<span style="color: #0000ff;"> 200px</span>;<span style="color: #ff0000;"> left</span>:<span style="color: #0000ff;"> 0</span>;<span style="color: #ff0000;"> top</span>:<span style="color: #0000ff;"> 0</span>;<span style="color: #ff0000;"> right</span>:<span style="color: #0000ff;"> 0</span>;<span style="color: #ff0000;"> bottom</span>:<span style="color: #0000ff;"> 0</span>;<span style="color: #ff0000;"> margin</span>:<span style="color: #0000ff;"> auto</span>;<span style="color: #ff0000;"> background-color</span>:<span style="color: #0000ff;"> #0ff</span>; }
4.0、table-cell居中(演示)
利用table-cell来控制垂直居中。
CSS:
<span style="color: #800000;">#container </span>{<span style="color: #ff0000;"> display</span>:<span style="color: #0000ff;"> table-cell</span>;<span style="color: #ff0000;"> width</span>:<span style="color: #0000ff;"> 600px</span>;<span style="color: #ff0000;"> height</span>:<span style="color: #0000ff;"> 500px</span>;<span style="color: #ff0000;"> vertical-align</span>:<span style="color: #0000ff;"> middle</span>;<span style="color: #ff0000;"> border</span>:<span style="color: #0000ff;"> 1px solid #000</span>; }<span style="color: #800000;"> #box </span>{<span style="color: #ff0000;"> width</span>:<span style="color: #0000ff;"> 200px</span>;<span style="color: #ff0000;"> height</span>:<span style="color: #0000ff;"> 200px</span>;<span style="color: #ff0000;"> margin</span>:<span style="color: #0000ff;"> 0 auto</span>;<span style="color: #ff0000;"> background-color</span>:<span style="color: #0000ff;"> #0ff</span>; }
5.0、flex居中(演示)
CSS3中引入的新布局方式,比较好用。缺点:IE9以及IE9一下不兼容。
CSS:
<span style="color: #800000;">#container </span>{<span style="color: #ff0000;"> display</span>:<span style="color: #0000ff;"> -webkit-flex</span>;<span style="color: #ff0000;"> display</span>:<span style="color: #0000ff;"> flex</span>;<span style="color: #ff0000;"> -webkit-align-items</span>:<span style="color: #0000ff;"> center</span>;<span style="color: #ff0000;"> align-items</span>:<span style="color: #0000ff;"> center</span>;<span style="color: #ff0000;"> -webkit-justify-content</span>:<span style="color: #0000ff;"> center</span>;<span style="color: #ff0000;"> justify-content</span>:<span style="color: #0000ff;"> center</span>;<span style="color: #ff0000;"> width</span>:<span style="color: #0000ff;"> 600px</span>;<span style="color: #ff0000;"> height</span>:<span style="color: #0000ff;"> 500px</span>;<span style="color: #ff0000;"> border</span>:<span style="color: #0000ff;"> 1px solid #000</span>;<span style="color: #ff0000;"> margin</span>:<span style="color: #0000ff;"> auto</span>; }<span style="color: #800000;"> #box </span>{<span style="color: #ff0000;"> width</span>:<span style="color: #0000ff;"> 200px</span>;<span style="color: #ff0000;"> height</span>:<span style="color: #0000ff;"> 200px</span>;<span style="color: #ff0000;"> background-color</span>:<span style="color: #0000ff;"> #0ff</span>; }
6.0、transform居中(演示)
这种方法灵活运用CSS中transform属性,较为新奇。缺点是IE9下不兼容。
CSS:
<span style="color: #800000;">#container </span>{<span style="color: #ff0000;"> position</span>:<span style="color: #0000ff;"> relative</span>;<span style="color: #ff0000;"> width</span>:<span style="color: #0000ff;"> 600px</span>;<span style="color: #ff0000;"> height</span>:<span style="color: #0000ff;"> 600px</span>;<span style="color: #ff0000;"> border</span>:<span style="color: #0000ff;"> 1px solid #000</span>;<span style="color: #ff0000;"> margin</span>:<span style="color: #0000ff;"> auto</span>; }<span style="color: #800000;"> #box </span>{<span style="color: #ff0000;"> position</span>:<span style="color: #0000ff;"> relative</span>;<span style="color: #ff0000;"> top</span>:<span style="color: #0000ff;"> 50%</span>;<span style="color: #ff0000;"> left</span>:<span style="color: #0000ff;"> 50%</span>;<span style="color: #ff0000;"> width</span>:<span style="color: #0000ff;"> 200px</span>;<span style="color: #ff0000;"> height</span>:<span style="color: #0000ff;"> 200px</span>;<span style="color: #ff0000;"> transform</span>:<span style="color: #0000ff;"> translate(-50%, -50%)</span>;<span style="color: #ff0000;"> -webkit-transform</span>:<span style="color: #0000ff;"> translate(-50%, -50%)</span>;<span style="color: #ff0000;"> -ms-transform</span>:<span style="color: #0000ff;"> translate(-50%, -50%)</span>;<span style="color: #ff0000;"> -moz-transform</span>:<span style="color: #0000ff;"> translate(-50%, -50%)</span>;<span style="color: #ff0000;"> background-color</span>:<span style="color: #0000ff;"> #0ff</span>; }
7.0、不确定宽高居中(绝对定位百分数)(演示)
这种不确定宽高的居中,较为灵活。只需要保证left和right的百分数一样就可以实现水平居中,保证top和bottom的百分数一样就可以实现垂直居中。
CSS:
<span style="color: #800000;">#container </span>{<span style="color: #ff0000;"> position</span>:<span style="color: #0000ff;"> relative</span>;<span style="color: #ff0000;"> width</span>:<span style="color: #0000ff;"> 600px</span>;<span style="color: #ff0000;"> height</span>:<span style="color: #0000ff;"> 500px</span>;<span style="color: #ff0000;"> border</span>:<span style="color: #0000ff;"> 1px solid #000</span>;<span style="color: #ff0000;"> margin</span>:<span style="color: #0000ff;"> auto</span>; }<span style="color: #800000;"> #box </span>{<span style="color: #ff0000;"> position</span>:<span style="color: #0000ff;"> absolute</span>;<span style="color: #ff0000;"> left</span>:<span style="color: #0000ff;"> 30%</span>;<span style="color: #ff0000;"> right</span>:<span style="color: #0000ff;"> 30%</span>;<span style="color: #ff0000;"> top</span>:<span style="color: #0000ff;"> 25%</span>;<span style="color: #ff0000;"> bottom</span>:<span style="color: #0000ff;"> 25%</span>;<span style="color: #ff0000;"> background-color</span>:<span style="color: #0000ff;"> #0ff</span>; }
8.0、button居中(演示)
利用button做外容器,里边的块元素会自动垂直居中,只需要控制一下水平居中就可以达到效果。
HTML:
<span style="color: #0000ff;"><span style="color: #800000;">button</span><span style="color: #0000ff;">></span> <span style="color: #0000ff;"><span style="color: #800000;">div</span><span style="color: #0000ff;">></span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span> <span style="color: #0000ff;"></span><span style="color: #800000;">button</span><span style="color: #0000ff;">></span></span></span>
CSS:
<span style="color: #800000;">button </span>{<span style="color: #ff0000;"> width</span>:<span style="color: #0000ff;"> 600px</span>;<span style="color: #ff0000;"> height</span>:<span style="color: #0000ff;"> 500px</span>;<span style="color: #ff0000;"> border</span>:<span style="color: #0000ff;"> 1px solid #000</span>; }<span style="color: #800000;"> div </span>{<span style="color: #ff0000;"> width</span>:<span style="color: #0000ff;"> 200px</span>;<span style="color: #ff0000;"> height</span>:<span style="color: #0000ff;"> 200px</span>;<span style="color: #ff0000;"> margin</span>:<span style="color: #0000ff;"> 0 auto</span>;<span style="color: #ff0000;"> background-color</span>:<span style="color: #0000ff;"> #0ff</span>; }

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 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.

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.

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

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.

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.

WebdevelopmentreliesonHTML,CSS,andJavaScript:1)HTMLstructurescontent,2)CSSstylesit,and3)JavaScriptaddsinteractivity,formingthebasisofmodernwebexperiences.

The role of HTML is to define the structure and content of a web page through tags and attributes. 1. HTML organizes content through tags such as , making it easy to read and understand. 2. Use semantic tags such as, etc. to enhance accessibility and SEO. 3. Optimizing HTML code can improve web page loading speed and user experience.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Atom editor mac version download
The most popular open source editor

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.

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

Dreamweaver CS6
Visual web development tools