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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: object-fit
+slug: Web/CSS/object-fit
+tags:
+ - CSS
+ - 图像
+ - 图像大小
+ - 图像缩放
+translation_of: Web/CSS/object-fit
+---
+<div>{{CSSRef}}</div>
+
+<p><strong><code>object-fit</code></strong> <a href="/zh-CN/docs/Web/CSS">CSS</a> 属性指定<a href="/zh-CN/docs/Web/CSS/Replaced_element">可替换元素</a>的内容应该如何适应到其使用的高度和宽度确定的框。</p>
+
+<p>您可以通过使用 {{cssxref("object-position")}} 属性来切换被替换元素的内容对象在元素框内的对齐方式。</p>
+
+<div>{{EmbedInteractiveExample("pages/css/object-fit.html")}}</div>
+
+
+
+<h2 id="Values" name="Values">语法</h2>
+
+<p>object-fit 属性由下列的值中的单独一个关键字来指定。</p>
+
+<h3 id="Values" name="Values">取值</h3>
+
+<dl>
+ <dt><code>contain</code></dt>
+ <dd>被替换的内容将被缩放,以在填充元素的内容框时保持其宽高比。 整个对象在填充盒子的同时保留其长宽比,因此如果宽高比与框的宽高比不匹配,该对象将被添加“<a href="https://zh.wikipedia.org/wiki/%E9%BB%91%E9%82%8A">黑边</a>”。</dd>
+ <dt><code>cover</code></dt>
+ <dd>被替换的内容在保持其宽高比的同时填充元素的整个内容框。如果对象的宽高比与内容框不相匹配,该对象将被剪裁以适应内容框。</dd>
+ <dt><code>fill</code></dt>
+ <dd>被替换的内容正好填充元素的内容框。整个对象将完全填充此框。如果对象的宽高比与内容框不相匹配,那么该对象将被拉伸以适应内容框。</dd>
+ <dt><code>none</code></dt>
+ <dd>被替换的内容将保持其原有的尺寸。</dd>
+ <dt><code>scale-down</code></dt>
+ <dd>内容的尺寸与 <code>none</code> 或 <code>contain</code> 中的一个相同,取决于它们两个之间谁得到的对象尺寸会更小一些。</dd>
+</dl>
+
+<h3 id="正式语法">正式语法</h3>
+
+<pre class="syntaxbox">{{csssyntax}}</pre>
+
+<h2 id="Example" name="Example">例子</h2>
+
+<h3 id="HTML">HTML</h3>
+
+<pre class="brush: html">&lt;div&gt;
+ &lt;h2&gt;object-fit: fill&lt;/h2&gt;
+ &lt;img src="https://mdn.mozillademos.org/files/6457/mdn_logo_only_color.png" alt="MDN Logo" class="fill"/&gt;
+
+ &lt;img src="https://mdn.mozillademos.org/files/6457/mdn_logo_only_color.png" alt="MDN Logo" class="fill narrow"/&gt;
+
+ &lt;h2&gt;object-fit: contain&lt;/h2&gt;
+ &lt;img src="https://mdn.mozillademos.org/files/6457/mdn_logo_only_color.png" alt="MDN Logo" class="contain"/&gt;
+
+ &lt;img src="https://mdn.mozillademos.org/files/6457/mdn_logo_only_color.png" alt="MDN Logo" class="contain narrow"/&gt;
+
+ &lt;h2&gt;object-fit: cover&lt;/h2&gt;
+ &lt;img src="https://mdn.mozillademos.org/files/6457/mdn_logo_only_color.png" alt="MDN Logo" class="cover"/&gt;
+
+ &lt;img src="https://mdn.mozillademos.org/files/6457/mdn_logo_only_color.png" alt="MDN Logo" class="cover narrow"/&gt;
+
+ &lt;h2&gt;object-fit: none&lt;/h2&gt;
+ &lt;img src="https://mdn.mozillademos.org/files/6457/mdn_logo_only_color.png" alt="MDN Logo" class="none"/&gt;
+
+ &lt;img src="https://mdn.mozillademos.org/files/6457/mdn_logo_only_color.png" alt="MDN Logo" class="none narrow"/&gt;
+
+ &lt;h2&gt;object-fit: scale-down&lt;/h2&gt;
+ &lt;img src="https://mdn.mozillademos.org/files/6457/mdn_logo_only_color.png" alt="MDN Logo" class="scale-down"/&gt;
+
+ &lt;img src="https://mdn.mozillademos.org/files/6457/mdn_logo_only_color.png" alt="MDN Logo" class="scale-down narrow"/&gt;
+
+&lt;/div&gt;
+</pre>
+
+<h3 id="CSS">CSS</h3>
+
+<pre class="brush: css">h2 {
+ font-family: Courier New, monospace;
+ font-size: 1em;
+ margin: 1em 0 0.3em;
+}
+
+div {
+ display: flex;
+ flex-direction: column;
+ flex-wrap: wrap;
+ align-items: flex-start;
+ height: 940px;
+}
+
+img {
+ width: 150px;
+ height: 100px;
+ border: 1px solid #000;
+}
+
+.narrow {
+ width: 100px;
+ height: 150px;
+ margin-top: 10px;
+}
+
+.fill {
+ object-fit: fill;
+}
+
+.contain {
+ object-fit: contain;
+}
+
+.cover {
+ object-fit: cover;
+}
+
+.none {
+ object-fit: none;
+}
+
+.scale-down {
+ object-fit: scale-down;
+}
+</pre>
+
+<h3 id="结果">结果</h3>
+
+<p>{{ EmbedLiveSample('Example', 500, 450) }}</p>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <thead>
+ <tr>
+ <th scope="col">规范</th>
+ <th scope="col">状态</th>
+ <th scope="col">备注</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td>{{SpecName('CSS4 Images', '#the-object-fit', 'object-fit')}}</td>
+ <td>{{Spec2('CSS4 Images')}}</td>
+ <td> </td>
+ </tr>
+ <tr>
+ <td>{{SpecName('CSS3 Images', '#the-object-fit', 'object-fit')}}</td>
+ <td>{{Spec2('CSS3 Images')}}</td>
+ <td>初始定义</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("css.properties.object-fit")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>其他与图像相关的CSS属性: {{cssxref("object-position")}}, {{cssxref("image-orientation")}}, {{cssxref("image-rendering")}}, {{cssxref("image-resolution")}}。</li>
+ <li>{{cssxref("background-size")}}</li>
+</ul>