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261 lines
27 KiB
HTML
261 lines
27 KiB
HTML
<article class="" id="post-">
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<header class="entry-header">
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<h1 class="entry-title">.fadeTo()</h1>
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<div class="entry-meta">
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所属分类：<span class="category"><a href="/category/effects/">特效</a> > <a href="/category/effects/fading/">渐变</a></span>
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<span class="pull-right">英文文档：<a href="https://api.jquery123.com/fadeTo/" target="_blank">.fadeTo()</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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<article class="entry method" id="fadeTo1"><h2 class="section-title">
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<span class="name">.fadeTo( duration, opacity [, complete ] )</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>调整匹配元素的透明度。</p>
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<ul class="signatures">
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<li class="signature" id="fadeTo-duration-opacity-complete">
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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>.fadeTo( duration, opacity [, complete ] )</h4>
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<ul>
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<li>
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<div><strong>duration</strong></div>
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<div>类型: <a href="/Types/#String,Number">String,Number</a>
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</div>
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<div>一个字符串或者数字决定动画将运行多久。</div>
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</li>
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<li>
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<div><strong>opacity</strong></div>
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<div>类型: <a href="/Types/#Number">Number</a>
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</div>
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<div>0和1之间的数字表示目标元素的不透明度。</div>
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</li>
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<li>
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<div><strong>complete</strong></div>
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<div>类型: <a href="/Types/#Function">Function</a>()</div>
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<div>在动画完成时执行的函数。</div>
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</li>
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</ul>
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</li>
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<li class="signature" id="fadeTo-duration-opacity-easing-complete">
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<h4 class="name">
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<span class="version-details">添加的版本: <a href="/category/version/1.4.3/">1.4.3</a></span>.fadeTo( duration, opacity [, easing ] [, complete ] )</h4>
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<ul>
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<li>
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<div><strong>duration</strong></div>
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<div>类型: <a href="/Types/#String,Number">String,Number</a>
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</div>
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<div>一个字符串或者数字决定动画将运行多久。</div>
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</li>
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<li>
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<div><strong>opacity</strong></div>
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<div>类型: <a href="/Types/#Number">Number</a>
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</div>
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<div>0和1之间的数字表示目标元素的不透明度。</div>
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</li>
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<li>
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<div><strong>easing</strong></div>
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<div>类型: <a href="/Types/#String">String</a>
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</div>
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<div>一个字符串，表示动画过渡使用哪种缓动函数。（译者注：jQuery自身提供"linear" 和 "swing"，其他可以使用相关的插件）</div>
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</li>
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<li>
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<div><strong>complete</strong></div>
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<div>类型: <a href="/Types/#Function">Function</a>()</div>
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<div>在动画完成时执行的函数。</div>
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</li>
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</ul>
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</li>
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</ul>
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<div class="longdesc" id="entry-longdesc">
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<p><code>.fadeTo()</code> 方法通过匹配元素的不透明度做动画效果。</p>
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<p>延时时间是以毫秒为单位的，数值越大，动画越慢，不是越快。字符串 <code>'fast'</code> 和 <code>'slow'</code> 分别代表200和600毫秒的延时。如果提供任何其他字符串，或者这个<code>duration</code>参数被省略，那么默认使用<code>400</code>毫秒的延时。和其他效果方法不同，<code>.fadeTo()</code>需要明确的指定<code>duration</code>参数。</p>
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<p>如果提供回调函数参数，回调函数会在动画完成的时候调用。这个对于将不同的动画串联在一起按顺序排列是非常有用的。这个回调函数不设置任何参数，但是<code>this</code>指向执行动画的DOM元素。如果多个元素一起做动画效果，值得注意的是这个回调函数在每个匹配元素上执行一次。这个动画不是作为一个整体。</p>
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<p>我们可以给任何元素做动画，比如一个简单的图片：</p>
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<div class="syntaxhighlighter xml nogutter">
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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="tag"><<span class="title">div</span> <span class="attribute">id</span>=<span class="value">"clickme"</span>></span></code></div></div><div class="container"><div class="line"><code> Click here</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> <span class="tag"><<span class="title">img</span> <span class="attribute">id</span>=<span class="value">"book"</span> <span class="attribute">src</span>=<span class="value">"book.png"</span> <span class="attribute">alt</span>=<span class="value">""</span> <span class="attribute">width</span>=<span class="value">"100"</span> <span class="attribute">height</span>=<span class="value">"123"</span> /></span></code></div></div><div class="container"><div class="line"><code> With the element initially shown, we can dim it slowly:</code></div></div><div class="container"><div class="line"><code> $('#clickme').click(function() {</code></div></div><div class="container"><div class="line"><code> $('#book').fadeTo('slow', 0.5, function() {</code></div></div><div class="container"><div class="line"><code> // Animation complete.</code></div></div><div class="container"><div class="line"><code> });</code></div></div><div class="container"><div class="line"><code> });</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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<p class="image four-across">
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<img alt="" src="/resources/0042_06_41.png"/>
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<img alt="" src="/resources/0042_06_42.png"/>
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<img alt="" src="/resources/0042_06_43.png"/>
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<img alt="" src="/resources/0042_06_44.png"/>
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</p>
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<p>将<code>duration</code>设置为<code>0</code>，这个方法只是改变<code>opacity</code> CSS属性，所以<code>.fadeTo(0, opacity)</code>和<code>.css('opacity', opacity)</code>是一样的效果。</p>
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</div>
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<h3>Additional Notes:(其他注意事项：)</h3>
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<div class="longdesc"><ul><li>
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所有jQuery效果，包括<code>.fadeTo()</code>,都能通过设置<code>jQuery.fx.off = true</code>全局的关闭，效果等同于持续时间设置为0。更多信息查看 <a href="/jquery.fx.off">jQuery.fx.off</a>.
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</li></ul></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">把第一个段落的透明度渐变成 0.33 (33%，大约三分之一透明度), 用时 600 毫秒。</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">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></code></div></div><div class="container"><div class="line"><code>Click this paragraph to see it fade.</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">p</span>></span></code></div></div><div class="container"><div class="line"><code>Compare to this one that won't fade.</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="string">"p:first"</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>$(<span class="keyword">this</span>).fadeTo(<span class="string">"slow"</span>, <span class="number">0.33</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></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">每次点击后把 div 渐变成随机透明度，用时 200 毫秒。</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">width</span>:<span class="value"><span class="number">80</span>px;</span></span> <span class="rule"><span class="attribute">margin</span>:<span class="value"><span class="number">0</span>;</span></span> <span class="rule"><span class="attribute">padding</span>:<span class="value"><span class="number">5</span>px;</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">width</span>:<span class="value"><span class="number">40</span>px;</span></span> <span class="rule"><span class="attribute">height</span>:<span class="value"><span class="number">40</span>px;</span></span> <span class="rule"><span class="attribute">position</span>:<span class="value">absolute;</span></span> <span class="rule">}</span></span></code></div></div><div class="container"><div class="line"><code><span class="tag">div</span><span class="id">#one</span> <span class="rules">{ <span class="rule"><span class="attribute">top</span>:<span class="value"><span class="number">0</span>;</span></span> <span class="rule"><span class="attribute">left</span>:<span class="value"><span class="number">0</span>;</span></span> <span class="rule"><span class="attribute">background</span>:<span class="value"><span class="hexcolor">#f00</span>;</span></span> <span class="rule">}</span></span></code></div></div><div class="container"><div class="line"><code><span class="tag">div</span><span class="id">#two</span> <span class="rules">{ <span class="rule"><span class="attribute">top</span>:<span class="value"><span class="number">20</span>px;</span></span> <span class="rule"><span class="attribute">left</span>:<span class="value"><span class="number">20</span>px;</span></span> <span class="rule"><span class="attribute">background</span>:<span class="value"><span class="hexcolor">#0f0</span>;</span></span> <span class="rule">}</span></span></code></div></div><div class="container"><div class="line"><code><span class="tag">div</span><span class="id">#three</span> <span class="rules">{ <span class="rule"><span class="attribute">top</span>:<span class="value"><span class="number">40</span>px;</span></span> <span class="rule"><span class="attribute">left</span>:<span class="value"><span class="number">40</span>px;</span></span> <span class="rule"><span class="attribute">background</span>:<span class="value"><span class="hexcolor">#00f</span>;</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>And this is the library that John built...<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">id</span>=<span class="value">"one"</span>></span><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 class="attribute">id</span>=<span class="value">"two"</span>></span><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 class="attribute">id</span>=<span class="value">"three"</span>></span><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">script</span>></span><span class="javascript"></span></code></div></div><div class="container"><div class="line"><code>$(<span class="string">"div"</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>$(<span class="keyword">this</span>).fadeTo(<span class="string">"fast"</span>, Math.random());</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>
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<div class="entry-example" id="example-2">
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<h4>Example: <span class="desc">找到正确答案！渐变耗时 250 毫秒，并且在完成后改变字体样式。</span>
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</h4>
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<div class="syntaxhighlighter xml ">
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<table>
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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">div</span>, <span class="tag">p</span> <span class="rules">{ <span class="rule"><span class="attribute">width</span>:<span class="value"><span class="number">80</span>px;</span></span> <span class="rule"><span class="attribute">height</span>:<span class="value"><span class="number">40</span>px;</span></span> <span class="rule"><span class="attribute">top</span>:<span class="value"><span class="number">0</span>;</span></span> <span class="rule"><span class="attribute">margin</span>:<span class="value"><span class="number">0</span>;</span></span></span></code></div></div><div class="container"><div class="line"><code><span class="rule"><span class="attribute">position</span>:<span class="value">absolute;</span></span> <span class="rule"><span class="attribute">padding-top</span>:<span class="value"><span class="number">8</span>px;</span></span> <span class="rule">}</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">background</span>:<span class="value"><span class="hexcolor">#fcc</span>;</span></span> <span class="rule"><span class="attribute">text-align</span>:<span class="value">center;</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">background</span>:<span class="value">blue;</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>Wrong<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">div</span>></span><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>Wrong<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">div</span>></span><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">p</span>></span>Right!<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">div</span>></span><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">script</span>></span><span class="javascript"></span></code></div></div><div class="container"><div class="line"><code><span class="keyword">var</span> getPos = <span class="function"><span class="keyword">function</span> <span class="params">(n)</span> {</span></code></div></div><div class="container"><div class="line"><code> <span class="keyword">return</span> (Math.floor(n) * <span class="number">90</span>) + <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">"p"</span>).each(<span class="function"><span class="keyword">function</span> <span class="params">(n)</span> {</span></code></div></div><div class="container"><div class="line"><code> <span class="keyword">var</span> r = Math.floor(Math.random() * <span class="number">3</span>);</code></div></div><div class="container"><div class="line"><code> <span class="keyword">var</span> tmp = $(<span class="keyword">this</span>).text();</code></div></div><div class="container"><div class="line"><code> $(<span class="keyword">this</span>).text($(<span class="string">"p:eq("</span> + r + <span class="string">")"</span>).text());</code></div></div><div class="container"><div class="line"><code> $(<span class="string">"p:eq("</span> + r + <span class="string">")"</span>).text(tmp);</code></div></div><div class="container"><div class="line"><code> $(<span class="keyword">this</span>).css(<span class="string">"left"</span>, getPos(n));</code></div></div><div class="container"><div class="line"><code>});</code></div></div><div class="container"><div class="line"><code>$(<span class="string">"div"</span>).each(<span class="function"><span class="keyword">function</span> <span class="params">(n)</span> {</span></code></div></div><div class="container"><div class="line"><code> $(<span class="keyword">this</span>).css(<span class="string">"left"</span>, getPos(n));</code></div></div><div class="container"><div class="line"><code>})</code></div></div><div class="container"><div class="line"><code>.css(<span class="string">"cursor"</span>, <span class="string">"pointer"</span>)</code></div></div><div class="container"><div class="line"><code>.click(<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>).fadeTo(<span class="number">250</span>, <span class="number">0.25</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>).css(<span class="string">"cursor"</span>, <span class="string">""</span>)</code></div></div><div class="container"><div class="line"><code> .prev().css({<span class="string">"font-weight"</span>: <span class="string">"bolder"</span>,</code></div></div><div class="container"><div class="line"><code> <span class="string">"font-style"</span>: <span class="string">"italic"</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> </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>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
</div>
|
||
<h4>Demo:</h4>
|
||
<div class="demo code-demo"></div>
|
||
</div></section>
|
||
</div></article> </div>
|
||
</article> |