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196 lines
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HTML
196 lines
20 KiB
HTML
<article class="" id="post-">
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<header class="entry-header">
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<h1 class="entry-title">.width()</h1>
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<div class="entry-meta">
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所属分类：<span class="category"><a href="/category/css/">CSS</a></span><span class="category-divider"> | </span><span class="category"><a href="/category/dimensions/">尺寸</a></span><span class="category-divider"> | </span><span class="category"><a href="/category/manipulation/">DOM 操作</a> > <a href="/category/manipulation/style-properties/">CSS 属性</a></span>
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<span class="pull-right">英文文档：<a href="https://api.jquery123.com/width/" target="_blank">.width()</a></span>
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</div><!-- .entry-meta -->
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</header><!-- .entry-header -->
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<!-- .entry-header -->
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<div class="entry-content">
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为匹配的元素集合中获取第一个元素的当前计算宽度值或给每个匹配的元素设置宽度。
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<div class="toc">
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<h4><span>Contents:</span></h4>
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<ul class="toc-list">
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<li>
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<a href="#width1">.width()</a><ul><li>.width()</li></ul>
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</li>
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<li>
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<a href="#width2">.width( value )</a><ul>
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<li>.width( value )</li>
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<li>.width( function(index, width) )</li>
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</ul>
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</li>
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</ul>
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</div><article class="entry method" id="width1"><h2 class="section-title">
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<span class="name">.width()</span><span class="returns">返回: <a href="/Types/#Integer">Integer</a></span>
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</h2>
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<div class="entry-wrapper">
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<p class="desc"><strong>描述: </strong>为匹配的元素集合中获取第一个元素的当前计算宽度值。</p>
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<ul class="signatures"><li class="signature" id="width">
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<h4 class="name">
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<span class="version-details">添加的版本: <a href="/category/version/1.0/">1.0</a></span>.width()</h4>
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<ul><li><div class="null-signature">这个方法不接受任何参数。</div></li></ul>
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</li></ul>
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<div class="longdesc" id="entry-longdesc">
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<p><code>.css(width)</code> 和 <code>.width()</code>之间的区别是后者返回一个没有单位的数值（例如，<code>400</code>），前者是返回带有完整单位的字符串（例如，<code>400px</code>）。当一个元素的宽度需要数学计算的时候推荐使用<code>.width()</code> 方法 。</p>
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<p class="image">
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<img src="/resources/0042_04_04.png"/>
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</p>
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<p>这个方法同样能计算出window和document的宽度。</p>
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<div class="syntaxhighlighter javascript nogutter">
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<td class="code">
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<pre><div class="container"><div class="line"><code>$(window).width(); <span class="comment">// returns width of browser viewport</span></code></div></div><div class="container"><div class="line"><code> $(document).width(); <span class="comment">// returns width of HTML document</span></code></div></div></pre>
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<p>注意<code>.width()</code>总是返回内容宽度,不管CSS <code>box-sizing</code>属性值。截至jQuery 1.8，这可能需要检索的CSS的宽度加加上<code>box-sizing</code>的属性，然后当元素有 <code>box-sizing: border-box</code>时候，减去个元素上任何潜在border和padding值。为了避免这种问题，使用<code>.css( "width" )</code>而非<code>.width()</code>。</p>
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</div>
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<section class="entry-examples" id="entry-examples"><header><h2 class="underline">例子:</h2></header><div class="entry-example" id="example-0">
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<h4><span class="desc">显示各个宽度。注意这个来自值iframe的值可能小于你的预期。黄色高亮显示iframe body。</span></h4>
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<div class="syntaxhighlighter xml ">
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<pre><div class="container"><div class="line"><code><span class="doctype"><!DOCTYPE html></span></code></div></div><div class="container"><div class="line"><code><span class="tag"><<span class="title">html</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"><<span class="title">head</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">style</span>></span><span class="css"></span></code></div></div><div class="container"><div class="line"><code> <span class="tag">body</span> <span class="rules">{ <span class="rule"><span class="attribute">background</span>:<span class="value">yellow;</span></span> <span class="rule">}</span></span></code></div></div><div class="container"><div class="line"><code> <span class="tag">button</span> <span class="rules">{ <span class="rule"><span class="attribute">font-size</span>:<span class="value"><span class="number">12</span>px;</span></span> <span class="rule"><span class="attribute">margin</span>:<span class="value"><span class="number">2</span>px;</span></span> <span class="rule">}</span></span></code></div></div><div class="container"><div class="line"><code> <span class="tag">p</span> <span class="rules">{ <span class="rule"><span class="attribute">width</span>:<span class="value"><span class="number">150</span>px;</span></span> <span class="rule"><span class="attribute">border</span>:<span class="value"><span class="number">1</span>px red solid;</span></span> <span class="rule">}</span></span></code></div></div><div class="container"><div class="line"><code> <span class="tag">div</span> <span class="rules">{ <span class="rule"><span class="attribute">color</span>:<span class="value">red;</span></span> <span class="rule"><span class="attribute">font-weight</span>:<span class="value">bold;</span></span> <span class="rule">}</span></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"></<span class="title">style</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">script</span> <span class="attribute">src</span>=<span class="value">"https://code.jquery.com/jquery-latest.js"</span>></span><span class="javascript"></span><span class="tag"></<span class="title">script</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"></<span class="title">head</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"><<span class="title">body</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">button</span> <span class="attribute">id</span>=<span class="value">"getp"</span>></span>Get Paragraph Width<span class="tag"></<span class="title">button</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">button</span> <span class="attribute">id</span>=<span class="value">"getd"</span>></span>Get Document Width<span class="tag"></<span class="title">button</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">button</span> <span class="attribute">id</span>=<span class="value">"getw"</span>></span>Get Window Width<span class="tag"></<span class="title">button</span>></span></code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">div</span>></span>&nbsp;<span class="tag"></<span class="title">div</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">p</span>></span></code></div></div><div class="container"><div class="line"><code> Sample paragraph to test width</code></div></div><div class="container"><div class="line"><code> <span class="tag"></<span class="title">p</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"><<span class="title">script</span>></span><span class="javascript"></span></code></div></div><div class="container"><div class="line"><code><span class="function"><span class="keyword">function</span> <span class="title">showWidth</span><span class="params">(ele, w)</span> {</span></code></div></div><div class="container"><div class="line"><code> $(<span class="string">"div"</span>).text(<span class="string">"The width for the "</span> + ele +</code></div></div><div class="container"><div class="line"><code> <span class="string">" is "</span> + w + <span class="string">"px."</span>);</code></div></div><div class="container"><div class="line"><code>}</code></div></div><div class="container"><div class="line"><code>$(<span class="string">"#getp"</span>).click(<span class="function"><span class="keyword">function</span> <span class="params">()</span> {</span></code></div></div><div class="container"><div class="line"><code> showWidth(<span class="string">"paragraph"</span>, $(<span class="string">"p"</span>).width());</code></div></div><div class="container"><div class="line"><code>});</code></div></div><div class="container"><div class="line"><code>$(<span class="string">"#getd"</span>).click(<span class="function"><span class="keyword">function</span> <span class="params">()</span> {</span></code></div></div><div class="container"><div class="line"><code> showWidth(<span class="string">"document"</span>, $(document).width());</code></div></div><div class="container"><div class="line"><code>});</code></div></div><div class="container"><div class="line"><code>$(<span class="string">"#getw"</span>).click(<span class="function"><span class="keyword">function</span> <span class="params">()</span> {</span></code></div></div><div class="container"><div class="line"><code> showWidth(<span class="string">"window"</span>, $(window).width());</code></div></div><div class="container"><div class="line"><code>});</code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code><span class="tag"></<span class="title">script</span>></span></code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code><span class="tag"></<span class="title">body</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"></<span class="title">html</span>></span></code></div></div></pre>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<h4>Demo:</h4>
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<div class="demo code-demo"></div>
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</div></section>
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</div></article><article class="entry method" id="width2"><h2 class="section-title">
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<span class="name">.width( value )</span><span class="returns">返回: <a href="/Types/#jQuery">jQuery</a></span>
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</h2>
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<div class="entry-wrapper">
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<p class="desc"><strong>描述: </strong>给每个匹配的元素设置CSS宽度。</p>
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<ul class="signatures">
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<li class="signature" id="width-value">
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<h4 class="name">
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<span class="version-details">添加的版本: <a href="/category/version/1.0/">1.0</a></span>.width( value )</h4>
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<ul><li>
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<div><strong>value</strong></div>
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<div>类型: <a href="/Types/#String,%20Number">String, Number</a>
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</div>
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<div>一个正整数代表的像素数,或是整数和一个可选的附加单位（默认是：“px”）(作为一个字符串)。</div>
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</li></ul>
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</li>
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<li class="signature" id="width-functionindex--width">
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<h4 class="name">
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<span class="version-details">添加的版本: <a href="/category/version/1.4.1/">1.4.1</a></span>.width( function(index, width) )</h4>
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<ul><li>
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<div><strong>function(index, width)</strong></div>
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<div>类型: <a href="/Types/#Function">Function</a>()</div>
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<div>返回用于设置宽度的一个函数。接收元素的索引位置和元素旧的高度值作为参数。在函数中
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<code>this</code>指向集合中当前的元素。</div>
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</li></ul>
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</li>
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</ul>
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<div class="longdesc" id="entry-longdesc-1">
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<p>当调用<code>.width(value)</code>方法的时候，这个“value”参数可以是一个字符串（数字加单位）或者是一个数字。如果这个“value”参数只提供一个数字，jQuery会自动加上单位px。如果只提供一个字符串，任何有效的CSS尺寸都可以为宽度赋值（就像<code>100px</code>, <code>50%</code>, 或者 <code>auto</code>）。注意在现代浏览器中，CSS宽度属性不包含padding, border, 或者 margin。除非<code>box-sizing</code> CSS属性被使用。</p>
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<p>如果没有给定明确的单位（像'em' 或者 '%'），那么默认情况下"px"会被直接添加上去（也理解为"px"是默认单位）。</p>
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<p>注意<code>.width('value')</code>设置的容器宽度是根据CSS <code>box-sizing</code>属性来定的, 将这个属性值改成<code>border-box</code>将造成这个函数改变成获取这个容器的outerWidth替换原来的内容宽度。</p>
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</div>
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<section class="entry-examples" id="entry-examples-1"><header><h2 class="underline">例子:</h2></header><div class="entry-example" id="example-1-0">
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<h4><span class="desc">点击每个div时设置该div宽度为30px，并改变颜色。</span></h4>
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<pre><div class="container"><div class="line"><code><span class="doctype"><!DOCTYPE html></span></code></div></div><div class="container"><div class="line"><code><span class="tag"><<span class="title">html</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"><<span class="title">head</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">style</span>></span><span class="css"></span></code></div></div><div class="container"><div class="line"><code><span class="tag">div</span> <span class="rules">{ <span class="rule"><span class="attribute">width</span>:<span class="value"> <span class="number">70</span>px;</span></span> <span class="rule"><span class="attribute">height</span>:<span class="value"> <span class="number">50</span>px;</span></span> <span class="rule"><span class="attribute">float</span>:<span class="value">left;</span></span> <span class="rule"><span class="attribute">margin</span>:<span class="value"> <span class="number">5</span>px;</span></span></span></code></div></div><div class="container"><div class="line"><code> <span class="rule"><span class="attribute">background</span>:<span class="value"> red;</span></span> <span class="rule"><span class="attribute">cursor</span>:<span class="value"> pointer;</span></span> <span class="rule">}</span></code></div></div><div class="container"><div class="line"><code><span class="class">.mod</span> <span class="rules">{ <span class="rule"><span class="attribute">background</span>:<span class="value"> blue;</span></span> <span class="rule"><span class="attribute">cursor</span>:<span class="value"> default;</span></span> <span class="rule">}</span></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"></<span class="title">style</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">script</span> <span class="attribute">src</span>=<span class="value">"https://code.jquery.com/jquery-latest.js"</span>></span><span class="javascript"></span><span class="tag"></<span class="title">script</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"></<span class="title">head</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"><<span class="title">body</span>></span></code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">div</span>></span>d<span class="tag"></<span class="title">div</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">div</span>></span>d<span class="tag"></<span class="title">div</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">div</span>></span>d<span class="tag"></<span class="title">div</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">div</span>></span>d<span class="tag"></<span class="title">div</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">div</span>></span>d<span class="tag"></<span class="title">div</span>></span></code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code><span class="tag"><<span class="title">script</span>></span><span class="javascript"></span></code></div></div><div class="container"><div class="line"><code>(<span class="keyword">function</span>() {</code></div></div><div class="container"><div class="line"><code> <span class="keyword">var</span> modWidth = <span class="number">50</span>;</code></div></div><div class="container"><div class="line"><code> $(<span class="string">"div"</span>).one(<span class="string">'click'</span>, <span class="function"><span class="keyword">function</span> <span class="params">()</span> {</span></code></div></div><div class="container"><div class="line"><code> $(<span class="keyword">this</span>).width(modWidth).addClass(<span class="string">"mod"</span>);</code></div></div><div class="container"><div class="line"><code> modWidth -= <span class="number">8</span>;</code></div></div><div class="container"><div class="line"><code> });</code></div></div><div class="container"><div class="line"><code>})();</code></div></div><div class="container"><div class="line"><code><span class="tag"></<span class="title">script</span>></span></code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code><span class="tag"></<span class="title">body</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"></<span class="title">html</span>></span></code></div></div></pre>
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</td>
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</tbody>
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</table>
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</div>
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<h4>Demo:</h4>
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<div class="demo code-demo"></div>
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</div></section>
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</div></article> </div>
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</article> |