HTML HTML maxlength属性在Chrome和Safari上无效

在本文中，我们将介绍HTML中的maxlength属性，在Chrome和Safari浏览器上为何无效，并提供解决方法。

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什么是maxlength属性

HTML中的maxlength属性用于限制用户在输入表单字段时输入的字符数量。它可以用于、和<input type="password">等元素。</p><div id="eaa_after_nth_p" class="eaa-wrapper eaa_after_nth_p eaa_desktop"><div class="eaa-ad " style=""><div class="aligncenter" style="max-width:336px;"> <ins class="adsbygoogle adsbygoogle-dis" style="display:block; text-align:center;" data-ad-layout="in-article" data-ad-format="fluid" data-ad-client="ca-pub-8722128765990495" data-ad-slot="8578744581"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script> </div></div></div> <p>例如，我们希望用户在一个<input type="text">元素中最多只能输入10个字符，我们可以将maxlength属性设置为10：</p> <pre data-language=HTML><code class="language-markup line-numbers"><input type="text" maxlength="10"> </code></pre> <h2>Chrome和Safari中的问题</h2> <p>然而，一些开发者在使用Chrome和Safari浏览器时发现，maxlength属性似乎无效。无论输入的字符数量是否超出限制，都可以继续输入。这给用户输入的限制带来了问题。</p> <p>这个问题的原因是Chrome和Safari浏览器对于maxlength属性的默认行为有所不同。在这两个浏览器中，默认情况下，maxlength属性仅仅限制了用户的可见字符数量，而不是实际的输入字符数量。</p> <p>例如，如果我们给一个<input type="text" maxlength="10">元素设置了maxlength属性为10，然后输入了11个半角字符，那么在Chrome和Safari浏览器中，用户仍然可以成功输入，并且显示的是11个字符。</p> <h2>解决方法</h2> <p>要解决这个问题，我们可以添加一些JavaScript代码来手动验证输入的字符数量，并在达到限制时阻止继续输入。下面是一个简单的示例：</p> <pre data-language=HTML><code class="language-markup line-numbers"><input type="text" id="myInput" maxlength="10"> <script> document.getElementById("myInput").addEventListener("input", function() { if (this.value.length > this.maxLength) { this.value = this.value.slice(0, this.maxLength); } }); </script> </code></pre> <p>在这个示例中，我们通过addEventListener方法添加了一个input事件的监听器，当用户在输入框中输入时，会触发该事件。</p><div id="eaa_after_nth_p_1" class="eaa-wrapper eaa_after_nth_p_1 eaa_desktop"><div class="eaa-ad " style=""><div class="inarticle2-top" style="height:350px;"> <div class="aligncenter div-process-inarticle2-3" wwadsclass="wwads-cn wwads-vertical" wwadsadid="298" style="display:none !important;max-width:336px;margin:auto;"></div> <div class="aligncenter div-process-inarticle2-2" adsenseclass="adsbygoogle process-inarticle2-2" adsenseslot="8512528184" adsenseslayoutkey="-ej+6y-29-jf+173" style="display:none !important;"></div> <div class="aligncenter" style="max-width:336px;"> <ins class="adsbygoogle process-inarticle2-1" style="display:block; text-align:center;" data-ad-layout="in-article" data-ad-format="fluid" data-ad-client="ca-pub-8722128765990495" data-ad-slot="4514374470"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script> </div> </div></div></div> <p>在事件处理函数中，我们首先检查输入框的值的长度是否超过了maxlength的限制。如果超过了限制，我们使用slice方法将输入框的值截断到maxlength的长度。</p> <p>这样，无论是在Chrome还是Safari浏览器中，当用户输入的字符数量超过限制时，都将无法继续输入。</p> <h2>总结</h2> <p>HTML中的maxlength属性在Chrome和Safari浏览器上默认只限制了可见字符数量，而不是实际的输入字符数量。为了解决这个问题，我们可以通过添加JavaScript代码手动验证输入，并截断超出限制的字符。通过这种方式，我们可以确保在任何浏览器中都能正确地限制用户的输入字符数量。</p> </p><div id="eaa_post_after_content" class="eaa-wrapper eaa_post_after_content eaa_desktop"><div class="eaa-ad " style=""><div class="wwads-cn wwads-vertical" data-id="298" 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