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<ul><li><code>row</code> ：沿着<code>Main-Axis</code><strong>从左向右，水平排列</strong>。(另<code>row-reverse</code> )</li> <li><code>column</code> ：沿着<code>Cross-Axis</code>从<strong>上到下垂直排列</strong>。(另<code>column-reverse</code>)</li></ul></li> <li><strong><code>flex-wrap</code></strong> 换行。
<ul><li><code>wrap</code> ：Flex项目在Flex容器内<strong>换行</strong>排列</li> <li><code>nowrap</code> ：Flex项目在Flex容器内<strong>不换行</strong>排列。</li> <li>wrap-reverse</li></ul></li> <li><strong><code>flex-flow</code></strong>: <code>flex-direction</code> + <code>flex-wrap</code></li> <li><strong><code>justify-content</code></strong> 控制Flex项目在<code>Main-Axis</code>上的对齐方式。
<ul><li><code>flex-start</code> : 所有Flex项目靠Main-Axis开始边缘（<strong>左对齐</strong>）。</li> <li><code>flex-end</code> ： ~~~~~~~~~~~~~~~~~~~~~~~~结束边缘（<strong>右对齐</strong>）。</li> <li><code>center</code> ： 让所有Flex项目排~~~~~~~~~~中间（<strong>居中对齐</strong>）。</li> <li><code>space-between</code> ： 让除了第一个和最一个Flex项目的两者间间距相同（<strong>两端对齐</strong>）。</li> <li><code>space-around</code> ： 让每个Flex项目<strong>具有相同的空间。</strong></li></ul></li> <li><strong><code>align-items</code></strong> 控制Flex项目在<code>Cross-Axis</code>上的对齐方式。
<ul><li><code>stretch</code> : 让所有的Flex项目高度和Flex容器高度一样。</li> <li><code>flex-start</code></li> <li><code>flex-end</code></li> <li><code>center</code>: 所有Flex项目在Cross-Axis上沿着他们自己的<strong>基线对齐</strong>。</li> <li><code>baseline</code></li></ul></li> <li><strong><code>align-content</code></strong> 用于多行的Flex容器。
<ul><li><code>flex-start || flex-end || center || stretch</code>。</li></ul></li></ul> <h2 id="_2-flex项目属性"><a href="#_2-flex项目属性" class="header-anchor">#</a> <strong>2. Flex项目属性</strong></h2> <ul><li><strong><code>flex-grow</code></strong> 默认为 <code>0</code> 有额外空间保持自身宽度； <code>1</code>: 有额外空间会撑开（<em>grow</em>了）。</li> <li><strong><code>flex-shrink</code></strong> 默认为 <code>1</code> , 没有额外空间保持自身宽度; <code>0</code>: 维持<strong>被压缩平均</strong>的宽度。</li> <li><strong><code>flex-basis</code></strong> 可以指定Flex项目的初始大小。也就是 <code>flex-grow</code> 和 <code>flex-shrink</code> 属性调整它的大小以适应Flex容器之前。默认为 <code>auto</code>。</li> <li><strong><code>flex</code></strong> （<strong>速记</strong>) => <code>flex-grow</code> 第一，然后是 <code>flex-shrink</code>，最后是 <code>flex-basis</code>。缩写成<code>GSB</code>。
<ul><li>默认： <code>flex: 0 1 auto;</code></li> <li><code>flex: none</code> => <code>flex: 0 0 auto;</code> , 宽度被自动计算，不过弹性项目<strong>始终</strong>不会伸展或者收缩。</li> <li><strong>相对flex项目</strong><code>flex: auto</code> => <code>flex: 1 1 auto</code> , 宽度被自动计算，不过<strong>如果有必要</strong>，<strong>会</strong>伸展或者收缩以适应整个可用宽度。</li> <li><strong>绝对flex项目</strong><code>flex: "positive number"</code> => <code>flex: “正数” 1 0</code> 。
<ul><li>将弹性项目的初始宽度设置为零，伸展项目以填满可用空间，并且最后只要有可能就收缩项目。</li> <li>当<strong>有多个弹性项目</strong>，并且其初始宽度 flex-basis 被设置为基于零的任何值时，弹性项目的宽度被根据 flex-grow 值的<strong>比例</strong>来计算。</li></ul></li></ul></li> <li><strong><code>align-self</code></strong> 改变<strong>一个</strong>弹性项目沿着侧轴的位置, 不影响相邻的弹性项目。
<ul><li><code>auto || flex-start || flex-end || center || baseline || stretch</code>。</li> <li><strong><code>order</code></strong> ，Flex项目会根据order值<strong>从底到高</strong>重新排序。</li></ul></li></ul> <h2 id="_3-auto-margin-对齐"><a href="#_3-auto-margin-对齐" class="header-anchor">#</a> <strong>3. Auto-margin 对齐</strong></h2> <p>当在Flex项目上使用 <code>margin: auto</code> 时，值为<code>auto</code> 的方向（左、右或者二者都是）会占据所有剩余空间。</p> <h2 id="_4-ffc-flex-formatting-context"><a href="#_4-ffc-flex-formatting-context" class="header-anchor">#</a> <strong>4. FFC (flex formatting context)</strong></h2> <p>Flexbox 布局新定义了格式化上下文，类似 BFC（block formatting context）。除了布局和一些细节不同以外的一切规则都和 BFC 是相同的。</p> <h3 id="与bfc的细微区别"><a href="#与bfc的细微区别" class="header-anchor">#</a> <strong>与BFC的细微区别</strong></h3> <ul><li><code>vertical-align</code>、<code>float</code> 和 <code>clear</code>对<code>Flexbox</code>中的子元素是没有效果的。</li> <li>Flexbox 下的子元素不会继承父级容器的宽</li></ul> <h3 id="flex-item-flex项目"><a href="#flex-item-flex项目" class="header-anchor">#</a> <strong>flex item（flex项目）</strong></h3> <p>CSS解析器会把子元素外部装进一个看不见的盒子里，我们通过排列这些盒子来达到排序、布局、 伸缩的目的。</p> <p>子元素中包括了 标签节点 以及 文本节点。标签节点很容易理解，需要注意的是文本节点。</p> <p>默认情况下，<code>flex</code> 会将 <strong>连续的文本节点</strong> 装进 flex-item 之中，使文本可以和标签节点一起排序和定位。</p> <p>空格也是文本节点，所以 white-space 会影响Flexbox 中的布局：
<img src="https://www.w3cplus.com/sites/default/files/blogs/2017/1703/flexbox3.png" alt="此处输入图片的描述"></p> <h2 id="_5-flex-item-size-如何计算的"><a href="#_5-flex-item-size-如何计算的" class="header-anchor">#</a> <strong>5. flex-item-size 如何计算的</strong></h2> <p><code>item-size</code>（尺寸）为主轴方向<code>上item</code>的 <code>content</code> 再加上自身的<code>margin</code>、 <code>border</code> 和 <code>padding</code> 就是这个 item 的尺寸。</p> <p>规则：</p> <h3 id="_1-子元素没有内容和默认固定宽高"><a href="#_1-子元素没有内容和默认固定宽高" class="header-anchor">#</a> <em>1. 子元素没有内容和默认固定宽高</em></h3> <p><code>flex-basis</code> > <code>width[height]: 非auto</code>;</p> <h3 id="_2-元素存在默认宽高"><a href="#_2-元素存在默认宽高" class="header-anchor">#</a> <em>2. 元素存在默认宽高</em></h3> <p>如果子元素有默认固定宽高、并且设置了 <code>flex-basis</code>，那么它的 <code>content</code> 取 <code>flex-basis</code> 和 <code>固定宽高</code>中较大的, 且以<strong>固定宽高</strong>为<strong>下限</strong>。</p> <h3 id="_3-元素存在-min-width-height-或者-max-width-height"><a href="#_3-元素存在-min-width-height-或者-max-width-height" class="header-anchor">#</a> <em>3.元素存在 min-width[height] 或者 max-width[height]</em></h3> <p>如果子元素有min-width[min-height] 的限制，那么content取 <code>flex-basis</code> 和 <code>min-width[min-height]</code> 中较大的，且以**<code>min-width</code><strong>值为</strong>下限**。</p> <p>如果 min-width[min-height] 的值已经<strong>超出了容器的尺寸</strong>，那么即使设置了 <code>flex-shrink</code>, CSS解析器也不会用这个item的 content shrink，而是坚持保留它的<code>min-width[min-height]</code>。</p> <p>反之，如果设置了 <code>max-width[height]</code> 的值，那么设置 <code>flex-basis</code> 无法超过这个值，对于<code>flex-grow</code> 也仅仅只会增长到 <code>max-width[height]</code> 这个上限。</p> <h3 id="_4-width-height-auto-优先级等于-flex-basis。"><a href="#_4-width-height-auto-优先级等于-flex-basis。" class="header-anchor">#</a> <em>4. width[height]: auto; 优先级等于 flex-basis。</em></h3> <p><strong>两者谁大取谁</strong></p> <p>参考：</p> <ol><li><a href="https://yoksel.github.io/flex-cheatsheet/#display" target="_blank" rel="noopener noreferrer">flex-cheatsheet<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></li> <li><a href="https://www.w3cplus.com/css3/understanding-flexbox-everything-you-need-to-know.html" target="_blank" rel="noopener noreferrer">understanding-flexbox-everything-you-need-to-know<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></li> <li><a href="https://www.w3cplus.com/css3/flexbox-layout-and-calculation.html?from=groupmessage" target="_blank" rel="noopener noreferrer">flexbox-layout-and-calculation<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></li></ol> <blockquote><p>思维流图。</p></blockquote> <p><img src="http://static.zybuluo.com/gao1994/sr8vhlxwou6jg36pk55jjwvi/flexboxsheet.png" alt="Flex1"></p> <div class="gitalk-container"><div id="gitalk-container"></div></div></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">最后更新:</span> <span class="time">2021/12/10 上午10:52:50</span></div></footer> <!----> </main></div><div class="global-ui"></div></div>
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