HTML5中文本長度限制是通過設置maxlength屬性來實現的。maxlength屬性規定了文本框或輸入框中允許輸入的最大字符數。我們可以將其放置在或標簽中。</p><pre><input type="text" name="username" maxlength="20"></pre><pre><textarea name="message" rows="5" cols="30" maxlength="200"></textarea></pre><p>上述代碼中，maxlength屬性的取值可以是任何正整數。當用戶輸入的字符數達到了最大限制時，文本框或輸入框就不能輸入更多的字符，這可以有效地限制用戶輸入的長度，防止輸入過長的文本。</p><p>需要注意的是，maxlength屬性并不是所有瀏覽器都支持的，特別是一些早期的瀏覽器。在設置maxlength屬性時，應該盡量考慮到不同瀏覽器的兼容性問題。</p></div><div id="y20wuma" class="share"></div><div id="c2emy20" class="Prev_Next"><div id="gisyemg" class="box">上一篇<a href="http://52shenghuonet.cn/post/882455.html">js去css</a></div><div id="escwoys" class="box">下一篇<a href="http://52shenghuonet.cn/post/1093253.html">html5設置dpi</a></div></div></div><div id="k0iugqw" class="related related-list"><h5>相關文章</h5><ul><li><a href="http://52shenghuonet.cn/post/1469806.html">html基礎教程都有哪些標題，詳細說明</a><span>08-04</span></li><li><a href="http://52shenghuonet.cn/post/1299849.html">html畫八卦動態代碼</a><span>06-30</span></li><li><a 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