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86 lines
5.1 KiB
HTML
86 lines
5.1 KiB
HTML
<article class="" id="post-">
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<header class="entry-header">
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<h1 class="entry-title">jQuery.type()</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.type/" target="_blank">jQuery.type()</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="jQuery-type1"><h2 class="section-title">
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<span class="name">jQuery.type( obj )</span><span class="returns">返回: <a href="/Types/#String">String</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JavaScript 对象的类型[[Class]] 。</p>
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<ul class="signatures"><li class="signature" id="jQuery-type-obj">
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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>jQuery.type( obj )</h4>
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<ul><li>
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<div><strong>obj</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>用来获取JavaScript数据类型[[Class]]的对象。</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>一些用来确定不同类型对象的数据类型。逻辑可以按以下方法确定：</p>
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<ul>
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<li>如果对象是undefined或null，则返回相应的“undefined”或“null”。
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<ul>
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<li>jQuery.type( undefined ) === "undefined"</li>
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<li>jQuery.type() === "undefined"</li>
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<li>jQuery.type( window.notDefined ) === "undefined"</li>
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<li>jQuery.type( null ) === "null"</li>
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</ul>
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</li>
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<li>如果对象有一个内部的[[Class]]和一个浏览器的内置对象的 [[Class]] 相同，我们返回相应的 [[Class]] 名字。
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(<a href="http://perfectionkills.com/instanceof-considered-harmful-or-how-to-write-a-robust-isarray/">有关此技术的更多细节。
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</a>)
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<ul>
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<li>jQuery.type( true ) === "boolean"</li>
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<li>jQuery.type( 3 ) === "number"</li>
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<li>jQuery.type( "test" ) === "string"</li>
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<li>jQuery.type( function(){} ) === "function"</li>
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<li>jQuery.type( [] ) === "array"</li>
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<li>jQuery.type( new Date() ) === "date"</li>
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<li>jQuery.type( new Error() ) === "error" // <strong>as of jQuery 1.9</strong>
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</li>
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<li>jQuery.type( /test/ ) === "regexp"</li>
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</ul>
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</li>
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<li>其他一切都将返回它的类型“object”。</li>
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</ul>
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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">找出如果该参数是一个正则表达式。</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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</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> Is it a RegExp? <span class="tag"><<span class="title">b</span>></span><span class="tag"></<span class="title">b</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">"b"</span>).append( <span class="string">""</span> + jQuery.type(<span class="regexp">/test/</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> |