如何使用HTML中的特殊字符？

<p>在HTML中使用特殊字符如&或</p> <p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/175338368351385.jpeg" class="lazy" alt="How to use special characters like & or < in HTML?"></p> <p> When working with special characters like <code>&</code> or <code> in HTML or web development, the key is understanding how to properly encode and use them so browsers interpret them correctly. Using them directly without encoding can break your HTML or display characters unexpectedly. </code></p> <img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/175338368413997.jpeg" class="lazy" alt="How to use special characters like & or < in HTML?"><h3 id="Why-You-Need-to-Use-Special-Characters"> Why You Need to Use Special Characters</h3> <p> In HTML, certain characters like <code>&</code> , <code> , and <code>></code> have special meanings. For example:</code></p> <ul> <li> <code>&</code> starts an HTML entity.</li> <li> <code> and <code>></code> are used to define tags.</code> </li> </ul> <p> If you try to use these characters as regular text (like in a paragraph), the browser might misinterpret them, causing issues like broken markup or incorrect rendering. That's why you need to use their corresponding HTML entities instead. </p> <img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/175338368532047.jpeg" class="lazy" alt="How to use special characters like & or < in HTML?"><h3 id="How-to-Use-code-amp-code-and-Other-Entities"> How to Use <code>&</code> and Other Entities</h3> <p> To safely display special characters in HTML, you use entities. These start with <code>&</code> and end with <code>;</code> . Here are a few common ones:</p> <ul> <li> <code>&</code> for <code>&</code> </li> <li> <code> for <code></code></code> </li> <li> <code>></code> for <code>></code> </li> <li> <code>"</code> for <code>"</code> </li> <li> <code>'</code> for <code>'</code> </li> </ul> <p> For example, if you want to display the text <code>5 15</code> , your HTML should look like this: </p> <img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/175338368654014.jpeg" class="lazy" alt="How to use special characters like & or < in HTML?"><pre class='brush:php;toolbar:false;'> <p>5 < 10 & 20 > 15</p></pre><p> This ensures the browser shows the correct characters without interpreting them as part of the HTML.</p> <h3 id="When-to-Encode-and-Decode"> When to Encode and Decode</h3> <p> You should encode special characters when:</p> <ul> <li> You're writing raw HTML and want to display these characters as text.</li> <li> You're dynamically inserting user-generated content into a webpage using JavaScript.</li> </ul> <p> If you're pulling content from a database or user input and inserting it into HTML, always make sure to escape those characters. In JavaScript, for example, you can use a function to replace <code>&</code> , <code> , and <code>></code> with their respective entities before inserting the text into the DOM.</code></p> <p> On the flip side, if you're parsing HTML or working with a string that contains entities and want to convert them back to characters, you can use tools or functions that decode HTML entities — like <code>textContent</code> in the DOM or libraries like <code>he.js</code> in JavaScript.</p> <h3 id="Common-Mistakes-and-How-to-Avoid-Them"> Common Mistakes and How to Avoid Them</h3> <p> One common mistake is forgetting to encode the <code>&</code> character itself. If you write something like <code>Red & Blue</code> in your HTML, the browser might think you're starting an entity and throw an error or display the text incorrectly.</p> <p> Another mistake is over-encoding. If you encode characters unnecessarily (like using <code><</code> instead of <code> ), the browser might not decode them properly, and users will see the entity instead of the intended character.</code></p> <p> To avoid these issues:</p> <ul> <li> Always encode <code>&</code> , <code> , and <code>></code> when displaying them as text.</code> </li> <li> Don't encode them when they're part of a tag or script.</li> <li> Use tools or libraries that automatically escape HTML when inserting dynamic content.</li> </ul> <p>基本上就這些. It's not complicated, but it's easy to overlook if you're not paying attention — especially when mixing HTML with dynamic content.</p>

以上是如何使用HTML中的特殊字符？的詳細內容。更多資訊請關注PHP中文網其他相關文章！