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197 lines
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197 lines
19 KiB
HTML
<article class="" id="post-">
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<header class="entry-header">
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<h1 class="entry-title">.offset()</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/offset/">偏移</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/offset/" target="_blank">.offset()</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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在匹配的元素集合中，获取的第一个元素的当前坐标，或设置每一个元素的坐标，坐标相对于文档。
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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="#offset1">.offset()</a><ul><li>.offset()</li></ul>
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</li>
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<li>
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<a href="#offset2">.offset( coordinates )</a><ul>
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<li>.offset( coordinates )</li>
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<li>.offset( function(index, coords) )</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="offset1"><h2 class="section-title">
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<span class="name">.offset()</span><span class="returns">返回: <a href="/Types/#Object">Object</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>在匹配的元素集合中，获取的第一个元素的当前坐标，坐标相对于文档。
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</p>
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<ul class="signatures"><li class="signature" id="offset">
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<h4 class="name">
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<span class="version-details">添加的版本: <a href="/category/version/1.2/">1.2</a></span>.offset()</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>.offset()</code>方法允许我们检索一个元素<em>相对于文档（document）</em>的当前位置。和<code><a href="/position">.position()</a></code>的差别在于：<code><a href="/position">.position()</a></code>是相对于<em>相对于父级元素</em>的位移。当通过全局操作（特别是通过拖拽操作）将一个新的元素放置到另一个已经存在的元素的上面时，若要取得这个新的元素的位置，那么使用 <code>.offset()</code> 更合适。</p>
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<p><code>.offset()</code>返回一个包含<code>top</code> 和 <code>left</code>属性的对象 。</p>
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<blockquote>
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<p><strong>注意：</strong>jQuery不支持获取隐藏元素的偏移坐标。同样的，也无法取得隐藏元素的 border, margin, 或 padding 信息。</p>
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<p>若元素的属性设置的是 <code>visibility:hidden</code>，那么我们依然可以取得它的坐标。但是若设置的属性是 <code>display:none</code>，由于在绘制 DOM 树时根本就不绘制该元素，所以它的位置属性值是 undefined。
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</p>
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</blockquote>
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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>Example: <span class="desc">使用第二个段落的位置：</span>
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</h4>
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<div class="syntaxhighlighter xml ">
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<table>
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<tbody>
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<tr>
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<td class="gutter">
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<div class="line n1">1</div>
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</td>
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<td class="code">
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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">p</span> <span class="rules">{ <span class="rule"><span class="attribute">margin-left</span>:<span class="value"><span class="number">10</span>px;</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">p</span>></span>Hello<span class="tag"></<span class="title">p</span>></span><span class="tag"><<span class="title">p</span>></span>2nd Paragraph<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 class="keyword">var</span> p = $(<span class="string">"p:last"</span>);</span></code></div></div><div class="container"><div class="line"><code><span class="keyword">var</span> offset = p.offset();</code></div></div><div class="container"><div class="line"><code>p.html( <span class="string">"left: "</span> + offset.left + <span class="string">", top: "</span> + offset.top );<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>
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<div class="entry-example" id="example-1">
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<h4>Example: <span class="desc">点击查看位置。</span>
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</h4>
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<div class="syntaxhighlighter xml ">
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<table>
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<tbody>
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<tr>
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<td class="gutter">
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<div class="line n1">1</div>
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<div class="line n2">2</div>
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<div class="line n3">3</div>
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</td>
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<td class="code">
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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">p</span> <span class="rules">{ <span class="rule"><span class="attribute">margin-left</span>:<span class="value"><span class="number">10</span>px;</span></span> <span class="rule"><span class="attribute">color</span>:<span class="value">blue;</span></span> <span class="rule"><span class="attribute">width</span>:<span class="value"><span class="number">200</span>px;</span></span></span></code></div></div><div class="container"><div class="line"><code> <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="tag">span</span> <span class="rules">{ <span class="rule"><span class="attribute">color</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></span></code></div></div><div class="container"><div class="line"><code><span class="tag">div</span><span class="class">.abs</span> <span class="rules">{ <span class="rule"><span class="attribute">width</span>:<span class="value"><span class="number">50</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">position</span>:<span class="value">absolute;</span></span></span></code></div></div><div class="container"><div class="line"><code> <span class="rule"><span class="attribute">left</span>:<span class="value"><span class="number">220</span>px;</span></span> <span class="rule"><span class="attribute">top</span>:<span class="value"><span class="number">35</span>px;</span></span> <span class="rule"><span class="attribute">background-color</span>:<span class="value">green;</span></span></code></div></div><div class="container"><div class="line"><code> <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="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">div</span> <span class="attribute">id</span>=<span class="value">"result"</span>></span>Click an element.<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> This is the best way to <span class="tag"><<span class="title">span</span>></span>find<span class="tag"></<span class="title">span</span>></span> an offset.</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> </code></div></div><div class="container"><div class="line"><code><span class="tag"><<span class="title">div</span> <span class="attribute">class</span>=<span class="value">"abs"</span>></span></code></div></div><div class="container"><div class="line"><code><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="string">"*"</span>, document.body).click(<span class="function"><span class="keyword">function</span> <span class="params">(e)</span> {</span></code></div></div><div class="container"><div class="line"><code> <span class="keyword">var</span> offset = $(<span class="keyword">this</span>).offset();</code></div></div><div class="container"><div class="line"><code> e.stopPropagation();</code></div></div><div class="container"><div class="line"><code> $(<span class="string">"#result"</span>).text(<span class="keyword">this</span>.tagName + <span class="string">" coords ( "</span> + offset.left + <span class="string">", "</span> +</code></div></div><div class="container"><div class="line"><code> offset.top + <span class="string">" )"</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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</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="offset2"><h2 class="section-title">
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<span class="name">.offset( coordinates )</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>
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设置匹配的元素集合中每一个元素的坐标，
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坐标相对于文档。</p>
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<ul class="signatures">
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<li class="signature" id="offset-coordinates">
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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/">1.4</a></span>.offset( coordinates )</h4>
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<ul><li>
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<div><strong>coordinates</strong></div>
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<div>类型: <a href="/Types/#PlainObject">PlainObject</a>
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</div>
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<div>一个包含<code>top</code> 和 <code>left</code>属性的对象，用整数指明元素的新顶部和左边坐标。</div>
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</li></ul>
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</li>
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<li class="signature" id="offset-functionindex--coords">
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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/">1.4</a></span>.offset( function(index, coords) )</h4>
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<ul><li>
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<div><strong>function(index, coords)</strong></div>
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<div>类型: <a href="/Types/#Function">Function</a>()</div>
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<div>返回用于设置坐标的一个函数。接收元素在匹配的元素集合中的索引位置作为第一个参数，和当前坐标作为第二个参数。这个函数应该返回一个包含<code>top</code> 和 <code>left</code>属性的对象。</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><code>.offset()</code>方法允许我们重新设置元素的位置，这个元素的位置是相对于document对象的。如果对象原先的<code>position</code>样式属性是<code>static</code>的话，会被改成<code>relative</code>来实现重定位。
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</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">设置第二个段落的位置:</span></h4>
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<div class="syntaxhighlighter xml ">
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<table>
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<tbody>
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<tr>
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<td class="gutter">
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<div class="line n1">1</div>
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<div class="line n2">2</div>
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<div class="line n3">3</div>
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<div class="line n4">4</div>
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<div class="line n5">5</div>
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<div class="line n6">6</div>
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<div class="line n7">7</div>
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<div class="line n8">8</div>
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<div class="line n9">9</div>
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<div class="line n10">10</div>
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<div class="line n11">11</div>
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<div class="line n12">12</div>
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</td>
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<td class="code">
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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 class="tag">p</span> <span class="rules">{ <span class="rule"><span class="attribute">margin-left</span>:<span class="value"><span class="number">10</span>px;</span></span> <span class="rule">}</span></span> </span><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">p</span>></span>Hello<span class="tag"></<span class="title">p</span>></span><span class="tag"><<span class="title">p</span>></span>2nd Paragraph<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 class="string">"p:last"</span>).offset({ top: <span class="number">10</span>, left: <span class="number">30</span> });</span><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> </div>
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</article> |