你應(yīng)該在需要可點擊控件執(zhí)行操作時使用<button>元素，1. 當(dāng)觸發(fā)操作時，如提交表單、打開模態(tài)框、切換菜單、播放媒體等；2. 為了更好的可訪問性，因為<button>原生支持屏幕閱讀器和鍵盤導(dǎo)航；3. 在表單中用於提交或重置操作，可通過type屬性控制行為；4. 當(dāng)需要靈活的樣式設(shè)計時，可通過CSS自定義外觀而不影響功能和可訪問性，因此只要點擊是執(zhí)行操作而非導(dǎo)航，就應(yīng)使用<button>元素，這是簡單、可訪問且可靠的做法。

You should use the <button></button> element whenever you need a clickable control that performs an action in the user interface. It's one of the most common and semantically correct choices for interactive elements. Here are the key situations when you should use it:

1. When triggering an action

Use <button></button> when the user click leads to a clear action, such as:

• Submitting a form ( <button type="submit"></button> )
• Opening a modal or dialog
• Toggling a menu or dropdown
• Adding/removing items
• Playing or pausing media

Example:

 <button type="button" onclick="playVideo()">Play</button>

2. For better accessibility

The <button> element is natively accessible. Screen readers recognize it as an interactive control, and it's keyboard-focusable by default (users can press Tab and activate it with Enter or Space). Using a <div> or <span> with click handlers doesn't provide this out of the box.

? Good:

 <button>Close</button>

? Avoid:

 <div onclick="close()">Close</div> <!-- Not accessible by default -->

3. Inside forms

Use <button> within forms for submit or reset actions. It gives you better control over behavior via the type attribute:

• type="submit" (default): submits the form
• type="reset" : resets form fields
• type="button" : performs a custom JavaScript action

Example:

 <form>
  <input type="text" name="email" />
  <button type="submit">Send</button>
  <button type="reset">Clear</button>
</form>

4. When styling flexibility is needed

Modern CSS makes <button> highly customizable. You can remove default styles and design it to look like a link, icon, or any UI element while keeping its functionality and accessibility.

Example of a button styled like a link:

 .button-as-link {
  background: none;
  border: none;
  color: blue;
  text-decoration: underline;
  cursor: pointer;
}

Just remember: if it looks like a link but performs an action (rather than navigating), it should still be a <button></button> , not an <a></a> .

Basically, if the user is doing something by clicking, use <button></button> . It's simple, accessible, and reliable.

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