<!doctype html><html><head><meta charset="UTF-8"><title>Web的Flex弹性盒模型</title><style> body{ font-family: '微软雅黑'; /*font-family: cursive, '微软雅黑';*/ padding: 0; margin: 20px 0 40px; font-size: 16px; background-color: #F9F9F9; } h1{ color: #0BF; text-indent: 15px; } h3{ color: #6D7273; text-indent: 15px; padding: 10px 0; background-color: #fff; } p{ margin: 0; padding: 0; color: #666; margin-bottom: 5px; } .boxes{ padding: 0 10px; overflow: hidden; display: -webkit-flex; flex-wrap: wrap; align-content:flex-start } .box{ width: 400px; padding: 8px; margin-right: 20px; margin-bottom: 10px; display: inline-block; box-shadow: 2px 2px 3px 1px #E0E0E0; } .boxstyle{ padding: 8px 0; } .boxborder{ border: 1px dashed #B6B6B6; } .demo{ color: #fff; display: -webkit-flex; text-align: center; } .demo .item{ line-height: 40px; background-color: #ddd; } .demo .item:nth-child(1){ background-color: #E46C49; } .demo .item:nth-child(2){ background-color: #37B0D3; } .demo .item:nth-child(3){ background-color: #68B33D; } .demo .item:nth-child(4){ background-color: #E46775; } .demo .item:nth-child(5){ background-color: #CFC731; } .demo .item:nth-child(6){ background-color: #8370F4; } .demo .item span{ display: block; } .demo2 .item{ height: 60px; width: 150px; word-wrap: break-word; line-height: 1.5; } .demo-row{ flex-direction: row; } .demo-row-reverse{ flex-direction: row-reverse; } .demo-column{ height: 200px; flex-direction: column; } .demo-column-reverse{ height: 200px; flex-direction: column-reverse; } .demo-nowrap{ -webkit-flex-wrap: nowrap; width: 400px; } .demo-wrap{ -webkit-flex-wrap: wrap; width: 400px; } .demo-wrap-reverse{ -webkit-flex-wrap: wrap-reverse; width: 400px; } .demo-align-content{ width: 400px; flex-wrap: wrap; height:200px; border: 1px dashed #B6B6B6; } .demo-align-content .item:nth-child(1), .demo-align-content .item:nth-child(2), .demo-align-content .item:nth-child(3), .demo-align-content .item:nth-child(4), .demo-align-content .item:nth-child(5), .demo-align-content .item:nth-child(6){ background-color: #717171; width: 80px; margin: 2px 10px; }</style></head><body> <h1 id="Web的Flex弹性盒模型">Web的Flex弹性盒模型</h1> <section> <h3 id="nbsp-flex-nbsp">[ flex ]</h3> <div> <div> <div> <p>display: -webkit-flex;</p> </div> <div class="demo demo1"> <div style="width:100px">width:100px;</div> <div style="flex:2">flex: 2;</div> <div style="flex:1">flex: 1;</div> </div> </div> <div> <div> <p>display: -webkit-flex; </p> </div> <div class="demo demo2 boxborder"> <div style="margin-right:10px;"> <span>width:150px;</span> <span>margin-right:10px;</span></div> <div style="flex:1">flex: 1;</div> <div style="margin-left:10px;"> <span>width:150px;</span> <span>margin-left:10px;</span></div> </div> </div> </div> <h3 id="nbsp-flex-direction-nbsp">[ flex-direction ]</h3> <div style="width:900px"> <div> <div> <p>flex-direction: row; /*default*/</p> <p>display: -webkit-flex;</p> </div> <div class="demo demo-row"> <div style="flex:1">flex: 1;</div> <div style="flex:2">flex: 2;</div> <div style="flex:3">flex: 3;</div> </div> </div> <div> <div> <p>flex-direction: row-reverse;</p> <p>display: -webkit-flex; </p> </div> <div class="demo demo-row-reverse"> <div style="flex:1">flex: 1;</div> <div style="flex:2">flex: 2;</div> <div style="flex:3">flex: 3;</div> </div> </div> <div> <div> <p>flex-direction: column;</p> <p>display: -webkit-flex; </p> </div> <div class="demo demo-column"> <div style="flex:1">flex: 1;</div> <div style="flex:2">flex: 2;</div> <div style="flex:3">flex: 3;</div> </div> </div> <div> <div> <p>flex-direction: column-reverse;</p> <p>display: -webkit-flex; </p> </div> <div class="demo demo-column-reverse"> <div style="flex:1">flex: 1;</div> <div style="flex:2">flex: 2;</div> <div style="flex:3">flex: 3;</div> </div> </div> </div> <h3 id="nbsp-flex-wrap-nbsp">[ flex-wrap ]</h3> <div style="width:1310px"> <div> <div> <p>-webkit-flex-wrap: nowrap; /* default */</p> <p>display: -webkit-flex; </p> <p>width: 400px</p> </div> <div class="demo demo-nowrap"> <div style="width: 100px">100px;</div> <div style="width: 200px">width: 200px;</div> <div style="width: 300px">width: 300px;</div> </div> </div> <div> <div> <p>-webkit-flex-wrap: wrap</p> <p>display: -webkit-flex; </p> <p>width: 400px</p> </div> <div class="demo demo-wrap boxborder"> <div style="width: 100px">100px;</div> <div style="width: 200px">width: 200px;</div> <div style="width: 300px">width: 300px;</div> </div> </div> <div> <div> <p>-webkit-flex-wrap: wrap-reverse</p> <p>display: -webkit-flex; </p> <p>width: 400px</p> </div> <div class="demo demo-wrap-reverse boxborder"> <div style="width: 100px">100px;</div> <div style="width: 200px">width: 200px;</div> <div style="width: 300px">width: 300px;</div> </div> </div> </div> <h3 id="nbsp-flex-flow-nbsp-nbsp-flex-direction-nbsp-flex-wrap-nbsp-nbsp-自个体会吧-nbsp">[ flex-flow ]: flex-direction flex-wrap; /* 自个体会吧 */</h3> <h3 id="nbsp-justify-content-nbsp">[ justify-content ]</h3> <div style="width:1310px;"> <div> <div> <p>/* 效果如同 float:left; */</p> <p>justify-content: flex-start; /* default */</p> <p>display: -webkit-flex;</p> </div> <div class="demo boxborder" style="justify-content: flex-start;"> <div style="width:100px">width:100px;</div> <div style="width:100px">width:100px;</div> </div> </div> <div> <div> <p><p>/* 效果如同 float:right; */</p></p> <p>justify-content: flex-end;</p> <p>display: -webkit-flex;</p> </div> <div class="demo demo-justify boxborder" style="justify-content: flex-end;"> <div style="width:100px">width:100px;</div> <div style="width:100px">width:100px;</div> </div> </div> <div> <div> <p>/* 第三代水平居中方案 */</p> <p>justify-content: center;</p> <p>display: -webkit-flex;</p> </div> <div class="demo demo-justify-end boxborder" style="justify-content: center;"> <div style="width:100px">width:100px;</div> <div style="width:100px">width:100px;</div> </div> </div> <div> <div> <p>justify-content: space-between; </p> <p>display: -webkit-flex;</p> </div> <div class="demo demo-justify boxborder" style="justify-content: space-between;"> <div style="width:100px">width:100px;</div> <div style="width:100px">width:100px;</div> </div> </div> <div> <div> <p>justify-content: space-around; </p> <p>display: -webkit-flex;</p> </div> <div class="demo demo-justify-end boxborder" style="justify-content: space-around;"> <div style="width:100px">width:100px;</div> <div style="width:100px">width:100px;</div> </div> </div> </div> <h3 id="nbsp-align-self-nbsp">[ align-self ]</h3> <div> <div style="width:1000px;"> <div> <p>display: -webkit-flex;</p> </div> <div class="demo boxborder" style="width: 1000px; height:200px;"> <div style="width:200px; align-self:flex-start;">align-self:flex-start;</div> <div style="width:200px; align-self:flex-end;">align-self:flex-end;</div> <div style="width:200px; align-self:center;">align-self:center;</div> <div style="width:200px; align-self:auto;"> <span>align-self:auto;</span> <span>/*default */</span> </div> <div style="width:200px; align-self:baseline;">align-self:baseline;</div> <div style="width:200px; align-self:stretch;">align-self:stretch;</div> </div> </div> </div> <h3 id="nbsp-align-items-nbsp">[ align-items ]</h3> <div> <div> <div> <p>align-items: flex-start; /* default */</p> <p>display: -webkit-flex;</p> </div> <div class="demo boxborder" style="align-items: flex-start;height:200px;"> <div style="width:100px">width:100px;</div> <div style="width:100px">width:100px;</div> </div> </div> <div> <div> <p>align-items: flex-end; </p> <p>display: -webkit-flex;</p> </div> <div class="demo boxborder" style="align-items: flex-end;height:200px;"> <div style="width:100px">width:100px;</div> <div style="width:100px">width:100px;</div> </div> </div> <div> <div> <p>/* 第三代垂直居中 */</p> <p>align-items: center; </p> <p>display: -webkit-flex;</p> </div> <div class="demo boxborder" style="align-items: center;height:200px;"> <div style="width:100px">width:100px;</div> <div style="width:100px">width:100px;</div> </div> </div> <div> <div> <p>align-items: baseline; </p> <p>display: -webkit-flex;</p> </div> <div class="demo boxborder" style="align-items: baseline;height:200px;"> <div style="width:100px">width:100px;</div> <div style="width:100px">width:100px;</div> </div> </div> <div> <div> <p>align-items: stretch; </p> <p>display: -webkit-flex;</p> </div> <div class="demo boxborder" style="align-items: stretch;height:200px;"> <div style="width:100px; height:100px;">height:100px;</div> <div style="width:150px; min-height:20px;">min-height:20px;</div> <div style="width:150px; max-height:60px;">max-height:60px;</div> </div> </div> </div> <h3 id="nbsp-align-content-nbsp">[ align-content ]</h3> <div> <div> <div> <p>/* <span style="color:red"> 对比 align-items</span>*/</p> <p>align-items: flex-start</p> <p>display: -webkit-flex;</p> </div> <div class="demo demo-align-content" style="align-items: flex-start"> <div >a</div> <div >b</div> <div >c</div> <div >d</div> <div >e</div> <div >f</div> </div> </div> <div> <div> <p>align-content: flex-start; </p> <p>display: -webkit-flex;</p> </div> <div class="demo demo-align-content" style="align-content: flex-start;"> <div >a</div> <div >b</div> <div >c</div> <div >d</div> <div >e</div> <div >f</div> </div> </div> <div> <div> <p>align-content: flex-end; </p> <p>display: -webkit-flex;</p> </div> <div class="demo demo-align-content" style="align-content: flex-end;"> <div >a</div> <div >b</div> <div >c</div> <div >d</div> <div >e</div> <div >f</div> </div> </div> <div> <div> <p>align-content: center; </p> <p>display: -webkit-flex;</p> </div> <div class="demo demo-align-content" style="align-content: center;"> <div >a</div> <div >b</div> <div >c</div> <div >d</div> <div >e</div> <div >f</div> </div> </div> <div> <div> <p>align-content: space-between; </p> <p>display: -webkit-flex;</p> </div> <div class="demo demo-align-content" style="align-content: space-between;"> <div >a</div> <div >b</div> <div >c</div> <div >d</div> <div >e</div> <div >f</div> </div> </div> <div> <div> <p>align-content: space-around; </p> <p>display: -webkit-flex;</p> </div> <div class="demo demo-align-content" style="align-content: space-around;"> <div >a</div> <div >b</div> <div >c</div> <div >d</div> <div >e</div> <div >f</div> </div> </div> <div> <div> <p>align-content: stretch; /*default*/ </p> <p>display: -webkit-flex;</p> </div> <div class="demo demo-align-content" style="align-content: stretch;"> <div >a</div> <div >b</div> <div >c</div> <div >d</div> <div >e</div> <div >f</div> </div> </div> </div> <h3 id="nbsp-order-nbsp">[ order ]</h3> <div> <div style="width:1000px;"> <div> <p>display: -webkit-flex;</p> </div> <div class="demo demo-align-content" style="width: 1000px;height:40px;"> <div >a</div> <div >b</div> <div >c</div> <div style="order:-1; width:120px"> d (order:-1) </div> <div >e</div> <div >f</div> </div> </div> </div> </section> </body></html>

The usage methods of HTML tags and attributes include: 1. Basic usage: Use tags such as and, and add necessary information through attributes such as src and href. 2. Advanced usage: Use data-* custom attributes to achieve complex interactions. 3. Avoid common mistakes: Make sure the property values are surrounded by quotes. 4. Performance optimization: Keep it simple, use standard attributes and CSS class names to ensure that the image has alt attributes. Mastering these will improve web development skills.

HTMLtagsdefinethestructureofawebpage,whileattributesaddfunctionalityanddetails.1)Tagslike,,andoutlinethecontent'splacement.2)Attributessuchassrc,class,andstyleenhancetagsbyspecifyingimagesources,styling,andmore,improvingfunctionalityandappearance.

The future of HTML will develop in a more semantic, functional and modular direction. 1) Semanticization will make the tag describe the content more clearly, improving SEO and barrier-free access. 2) Functionalization will introduce new elements and attributes to meet user needs. 3) Modularity will support component development and improve code reusability.

HTMLattributesarecrucialinwebdevelopmentforcontrollingbehavior,appearance,andfunctionality.Theyenhanceinteractivity,accessibility,andSEO.Forexample,thesrcattributeintagsimpactsSEO,whileonclickintagsaddsinteractivity.Touseattributeseffectively:1)Usese

The alt attribute is an important part of the tag in HTML and is used to provide alternative text for images. 1. When the image cannot be loaded, the text in the alt attribute will be displayed to improve the user experience. 2. Screen readers use the alt attribute to help visually impaired users understand the content of the picture. 3. Search engines index text in the alt attribute to improve the SEO ranking of web pages.

The roles of HTML, CSS and JavaScript in web development are: 1. HTML is used to build web page structure; 2. CSS is used to beautify the appearance of web pages; 3. JavaScript is used to achieve dynamic interaction. Through tags, styles and scripts, these three together build the core functions of modern web pages.

Setting the lang attributes of a tag is a key step in optimizing web accessibility and SEO. 1) Set the lang attribute in the tag, such as. 2) In multilingual content, set lang attributes for different language parts, such as. 3) Use language codes that comply with ISO639-1 standards, such as "en", "fr", "zh", etc. Correctly setting the lang attribute can improve the accessibility of web pages and search engine rankings.

HTMLattributesareessentialforenhancingwebelements'functionalityandappearance.Theyaddinformationtodefinebehavior,appearance,andinteraction,makingwebsitesinteractive,responsive,andvisuallyappealing.Attributeslikesrc,href,class,type,anddisabledtransform


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