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63 lines
4.6 KiB
HTML
63 lines
4.6 KiB
HTML
<article class="" id="post-">
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<header class="entry-header">
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<h1 class="entry-title">jQuery.isNumeric()</h1>
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<div class="entry-meta">
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所属分类：<span class="category"><a href="/category/utilities/">工具类</a></span>
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<span class="pull-right">英文文档：<a href="https://api.jquery123.com/jQuery.isNumeric/" target="_blank">jQuery.isNumeric()</a></span>
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</div><!-- .entry-meta -->
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</header><!-- .entry-header -->
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<div class="entry-content">
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<article class="entry method" id="jQuery-isNumeric1"><h2 class="section-title">
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<span class="name">jQuery.isNumeric( value )</span><span class="returns">返回: <a href="/Types/#Boolean">Boolean</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>确定它的参数是否是一个数字。</p>
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<ul class="signatures"><li class="signature" id="jQuery-isNumeric-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/1.7/">1.7</a></span>jQuery.isNumeric( 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/#PlainObject">PlainObject</a>
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</div>
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<div>用于测试的值。</div>
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</li></ul>
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</li></ul>
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<div class="longdesc" id="entry-longdesc">
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<p>
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<code>$.isNumeric()</code> 方法检查它的参数是否代表一个数值。如果是，它返回 <code>true</code>。否则，它返回<code>false</code>。该参数可以是任何类型。
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</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">以下是使用 $.isNumeric 检测各种输入类型的例子。</span></h4>
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<div class="syntaxhighlighter javascript ">
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<td class="code">
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<pre><div class="container"><div class="line"><code>$.isNumeric(<span class="string">"-10"</span>); <span class="comment">// true</span></code></div></div><div class="container"><div class="line"><code>$.isNumeric(<span class="number">16</span>); <span class="comment">// true</span></code></div></div><div class="container"><div class="line"><code>$.isNumeric(<span class="number">0xFF</span>); <span class="comment">// true</span></code></div></div><div class="container"><div class="line"><code>$.isNumeric(<span class="string">"0xFF"</span>); <span class="comment">// true</span></code></div></div><div class="container"><div class="line"><code>$.isNumeric(<span class="string">"8e5"</span>); <span class="comment">// true (exponential notation string)</span></code></div></div><div class="container"><div class="line"><code>$.isNumeric(<span class="number">3.1415</span>); <span class="comment">// true</span></code></div></div><div class="container"><div class="line"><code>$.isNumeric(+<span class="number">10</span>); <span class="comment">// true</span></code></div></div><div class="container"><div class="line"><code>$.isNumeric(<span class="number">0144</span>); <span class="comment">// true (octal integer literal)</span></code></div></div><div class="container"><div class="line"><code>$.isNumeric(<span class="string">""</span>); <span class="comment">// false</span></code></div></div><div class="container"><div class="line"><code>$.isNumeric({}); <span class="comment">// false (empty object)</span></code></div></div><div class="container"><div class="line"><code>$.isNumeric(<span class="literal">NaN</span>); <span class="comment">// false</span></code></div></div><div class="container"><div class="line"><code>$.isNumeric(<span class="literal">null</span>); <span class="comment">// false</span></code></div></div><div class="container"><div class="line"><code>$.isNumeric(<span class="literal">true</span>); <span class="comment">// false</span></code></div></div><div class="container"><div class="line"><code>$.isNumeric(<span class="literal">Infinity</span>); <span class="comment">// false</span></code></div></div><div class="container"><div class="line"><code>$.isNumeric(<span class="literal">undefined</span>); <span class="comment">// false</span></code></div></div></pre>
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