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聖光之護
发布时间：2026-01-21 21:54:21
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该代码通过先重置 textarea 高度为极小值（如 '5px'），再设为 scrollheight，强制触发浏览器重新计算内容高度，从而实现无滚动条的自适应伸缩。
在 Web 开发中，让 根据输入内容自动伸缩（即“自适应高度”）是一个常见需求。上面这段 React 代码正是实现该功能的核心逻辑：
{ event.target.style.height = '5px'; // 步骤①：临时重置高度 event.target.style.height = event.target.scrollHeight + 'px'; // 步骤②：设为实际内容所需高度 }} /></pre><p><strong><a style="color:#f60; text-decoration:underline;" title="为什么" href="https://www.php.cn/zt/92702.html" target="_blank">为什么</a>需要两步？关键在于浏览器的渲染机制：</strong><br>scrollHeight 返回的是元素内容的<strong>完整高度</strong>（包括溢出部分），但它依赖于当前元素的<strong>已计算样式</strong>（computed style）。如果 textarea 当前已有较大高度（例如因之前输入而撑开），浏览器可能缓存了布局信息，直接赋值 scrollHeight 可能无法触发准确重测量——尤其当内容变少、行数减少时，scrollHeight 值可能未及时更新。</p> <p>✅ <strong>第一步 event.target.style.height = '5px'</strong>：<br> 将内联 height 强制设为一个极小值（远小于默认行高），迫使浏览器“忘记”之前的尺寸假设，清空高度缓存，并立即触发布局重排（reflow）。此时 textarea 高度被压缩，内容开始溢出，scrollHeight 便能真实反映当前文本所需的最小高度。</p> <p>✅ <strong>第二步 event.target.style.height = event.target.scrollHeight + 'px'</strong>：<br> 在重排后立即读取更新后的 scrollHeight（此时已准确包含换行、字体、行高、padding 等影响），再将 height 设为该值，使 textarea 刚好包裹全部内容，不留空白也不出现滚动条。</p> <p>⚠️ 注意事项：</p><div class="aritcle_card flexRow"> <div class="artcardd flexRow"> <a class="aritcle_card_img" href="/xiazai/code/9444" title="毕节热线企业建站系统5.1"><img src="https://img.php.cn/upload/webcode/000/000/018/175898160515922.jpg" alt="毕节热线企业建站系统5.1"></a> <div class="aritcle_card_info flexColumn"> <a href="/xiazai/code/9444" title="毕节热线企业建站系统5.1">毕节热线企业建站系统5.1</a> <p>毕节热线企业建站系统拥有一下系统功能，且具备完整后台，功能没有限制。一、公司介绍系统：将您的公司展现给广大用户，提高企业知名度。二、内容管理系统：可以发布新闻、公司动态等内容。三、产品展示系统：展示产品，同时提供在线订购功能。四、人才招聘系统：发布公司招聘信息，同时提供在线应聘功能。五、留言系统。六、投票系统。本次更新修改内容：1.在后台增加网站关键字和网站描述功能。2.网站前台栏目全部采用调用I</p> </div> <a href="/xiazai/code/9444" title="毕节热线企业建站系统5.1" class="aritcle_card_btn flexRow flexcenter"><b></b><span>下载</span> </a> </div> </div> <ul> <li>必须使用 onInput（而非 onChange），以实时响应每一次输入（包括粘贴、删除、回车等）；</li> <li>scrollHeight 包含 padding（但不含 border 或 margin），因此建议 textarea 的 box-sizing 保持默认 content-box，或统一设为 border-box 并确保 padding 值稳定；</li> <li>若需兼容 Safari 等对 scrollHeight 计算稍滞后的浏览器，可加微小延迟（不推荐）或配合 offsetHeight 校验，但多数场景下双步法已足够鲁棒；</li> <li>实际项目中建议封装为自定义 Hook（如 useAutosizeTextarea），并添加最小/最大高度限制、防抖（避免高频触发）、以及初始渲染适配等健壮性处理。</li> </ul> <p>总结：这不是“多此一举”，而是巧妙利用浏览器渲染流水线特性——用一次“收缩”换取一次精准“伸展”，是<a style="color:#f60; text-decoration:underline;" title="前端" href="https://www.php.cn/zt/15813.html" target="_blank">前端</a>实现平滑自适应 textarea 的经典实践。</p> </div> <div class="artmoreart "> <div class="artdp artptit"><span></span> <p>相关文章</p> </div> <div class="artmores flexColumn"> <a class="artmrlis flexRow" href="/faq/2010198.html" title="如何在 React 列表中只为单个项触发状态变更？"><b></b> <p class="overflowclass">如何在 React 列表中只为单个项触发状态变更？</p> </a> <a class="artmrlis flexRow" href="/faq/2010179.html" title="React 中解决自动补全组件点击失效的事件竞态问题"><b></b> <p class="overflowclass">React 中解决自动补全组件点击失效的事件竞态问题</p> </a> <a class="artmrlis flexRow" href="/faq/2010068.html" title="如何在 React 列表中只为单个项触发状态更新？"><b></b> <p class="overflowclass">如何在 React 列表中只为单个项触发状态更新？</p> </a> <a class="artmrlis flexRow" href="/faq/2009954.html" title="React 中下拉列表点击失效的事件竞态问题解决方案"><b></b> <p class="overflowclass">React 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