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copied!<p>Use either <a href="http://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/String/toLowerCase" rel="noreferrer">toLowerCase</a> or <a href="http://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/String/toLocaleLowerCase" rel="noreferrer">toLocaleLowerCase</a> methods of the <a href="http://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/String" rel="noreferrer">String</a> object. The difference is that <code>toLocaleLowerCase</code> will take current locale of the user/host into account. As per § 15.5.4.17 of the <a href="http://www.ecma-international.org/publications/standards/Ecma-262.htm" rel="noreferrer">ECMAScript Language Specification (ECMA-262)</a>, <code>toLocaleLowerCase</code>…</p> <blockquote> <p>…works exactly the same as toLowerCase except that its result is intended to yield the correct result for the host environment’s current locale, rather than a locale-independent result. There will only be a difference in the few cases (such as Turkish) where the rules for that language conflict with the regular Unicode case mappings.</p> </blockquote> <p>Example:</p> <pre><code>var lower = 'Your Name'.toLowerCase(); </code></pre> <p>Also note that the <code>toLowerCase</code> and <code>toLocaleLowerCase</code> functions are implemented to work generically on <em>any</em> value type. Therefore you can invoke these functions even on non-<code>String</code> objects. Doing so will imply automatic conversion to a string value prior to changing the case of each character in the resulting string value. For example, you can <em>apply</em> <code>toLowerCase</code> directly on a date like this:</p> <pre><code>var lower = String.prototype.toLowerCase.apply(new Date()); </code></pre> <p>and which is effectively equivalent to:</p> <pre><code>var lower = new Date().toString().toLowerCase(); </code></pre> <p>The second form is generally preferred for its simplicity and readability. On earlier versions of IE, the first had the benefit that it could work with a <code>null</code> value. The result of applying <code>toLowerCase</code> or <code>toLocaleLowerCase</code> on <code>null</code> would yield <code>null</code> (and not an error condition).</p>

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