上次简要的说了一些css3中flex的相关概念(详细: css学习16:css3 flex流动自适应响应式布局设计 ),这次继续说下css3的flex,简单的举几个实例。
一、图片自适应居中
实例图:
实例HTML:
<div class="demo"> <img src="/static/imghwm/default1.png" data-src="http://dummyimage.com/100x100" class="lazy" alt=""></div><div class="demo"> <img src="/static/imghwm/default1.png" data-src="http://dummyimage.com/200x100" class="lazy" class="" alt=""></div><div class="demo"> <img src="/static/imghwm/default1.png" data-src="http://dummyimage.com/100x200" class="lazy" alt=""></div><div class="demo"> <img src="/static/imghwm/default1.png" data-src="http://dummyimage.com/200x200" class="lazy" alt=""></div><div class="demo"> <img src="/static/imghwm/default1.png" data-src="http://dummyimage.com/50x50" class="lazy" alt=""></div>
实例CSS:
.demo{ width: 100px; height: 100px; border: 2px solid #ddd; background: #f5f5f5; padding: 6px; float: left; margin-left: 20px; /*flex布局(作用于容器)*/ display: flex; /*水平居中(作用于容器)*/ justify-content: center; /*垂直居中(作用于容器)*/ align-items: center;}.demo img{ max-width: 100px; max-height: 100px; width: auto; height: auto;}
demo: http://demo.qianduanblog.com/2799/1.html
二、水平响应式列表
实例图:
实例HTML:
<div class="demo-wrap"> <div class="demo"> <div class="item item1">高120px</div> <div class="item item2">高50px</div> <div class="item item3">高140px</div> <div class="item item4">高100px</div> </div></div>
实例CSS:
.demo-wrap{ border: 2px solid #ddd; background: #f5f5f5; padding: 6px;}.demo{ width: 100%; /*flex布局(作用于容器)*/ display: flex; /*两端对齐(作用于容器)*/ justify-content: space-between;}.demo .item{ width: 100px; background: #ffd; color: #C90000; font-size: 20px; text-align: center; line-height: 50px;}.demo .item1{ height: 120px;}.demo .item2{ height: 50px;}.demo .item3{ height: 140px;}.demo .item4{ height: 100px;}
demo: http://demo.qianduanblog.com/2799/2.html
三、水平响应式列表底端对齐
和上个例子差不多,只是增加了底端对齐的的特性。
只是修改了容器的样式:
.demo{ width: 100%; /*flex布局(作用于容器)*/ display: flex; /*两端对齐(作用于容器)*/ justify-content: space-around; /*侧轴方向对齐方式(作用于容器)*/ align-items: flex-end;}
demo: http://demo.qianduanblog.com/2799/3.html
四、多行响应式布局
宽屏:
中屏:
窄屏:
HTML代码:
<div class="demo-wrap"> <div class="demo"> <div class="item"></div> <div class="item"></div> <div class="item"></div> <div class="item"></div> <div class="item"></div> <div class="item"></div> <div class="item"></div> <div class="item"></div> </div></div>
CSS代码:
.demo-wrap{ border: 2px solid #ddd; background: #f5f5f5; padding: 6px;}.demo{ width: 100%; /*flex布局(作用于容器)*/ display: flex; /*两端对齐(作用于容器)*/ justify-content: space-around; /*侧轴方向对齐方式(作用于容器)*/ align-items: flex-end; /*换行(作用于容器)*/ flex-wrap: wrap;}.demo .item{ width: 300px; height: 50px; background: #444; margin-bottom: 20px;}
demo: http://demo.qianduanblog.com/2799/4.html
五、左固定右自适应等高布局
演示截图:
HTML:
<div class="demo"> <div class="left">左边固定宽度为100px,这里设置了高度为auto</div> <div class="right">右边宽度自适应,并且左右两个区域是等高的,这里设置了高度为200px</div></div>
CSS:
.demo{ /*flex布局(作用于容器)*/ display: flex; /*项目拉伸对齐,也就是所左边的高度为拉伸到和右边等高,默认是拉伸的*/ /*align-items: stretch;*/}.demo .left{ /*左边固定宽度,必须设置其最小宽度和最大宽度*/ width: 100px; min-width: 100px; max-width: 100px; /*高度自由分配*/ height: auto; background: #B4D3F7; /*空白区域分配比例为0(作用于项目)*/ flex-grow: 0;}.demo .right{ margin-left: 10px; width: auto; height: 200px; background: #F7E8B4; /*空白区域分配比例为1(作用于项目) 左右得到的空白比例为0:1,所以右边会分配到剩余的所有空白区域, 左边成固定的宽度,右边为自适应宽度*/ flex-grow: 1;}
demo: http://demo.qianduanblog.com/2799/5.html
六、左右固定中间自适应宽度底部对齐布局
上面的例子是左右布局的,相比较而言,双栏布局会做了,那么三栏布局也就不是问题了。先看实例图:
HTML:
<div class="demo"> <div class="left">左边固定宽度为100px,这里设置了高度为auto</div> <div class="center">中间宽度自适应,并且左中右两个区域是等高的,这里设置了高度为200px</div> <div class="right">右边固定宽度为150px,这里设置了高度为auto</div></div>
CSS:
.demo{ /*flex布局(作用于容器)*/ display: flex; /*项目拉伸对齐,也就是所左边的高度为拉伸到和右边底部对齐*/ align-items: flex-end;}.demo .left{ /*左边固定宽度,必须设置其最小宽度和最大宽度*/ width: 100px; min-width: 100px; max-width: 100px; /*高度自由分配*/ height: auto; background: #B4D3F7; /*空白区域分配比例为0(作用于项目)*/ flex-grow: 0;}.demo .center{ margin: 0 10px; width: auto; height: 200px; background: #F7E8B4; /*空白区域分配比例为1(作用于项目) 左右得到的空白比例为0:1,所以右边会分配到剩余的所有空白区域, 左边成固定的宽度,右边为自适应宽度*/ flex-grow: 1;}.demo .right{ /*右边固定宽度,必须设置其最小宽度和最大宽度*/ width: 150px; min-width: 150px; max-width: 150px; /*高度自由分配*/ height: auto; background: #CBFFD2; /*空白区域分配比例为0(作用于项目)*/ flex-grow: 0;}
demo: http://demo.qianduanblog.com/2799/6.html

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.

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.


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