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React v 稳定版本和新增功能

来源:dev.to 2024-12-28 22:01:05 0浏览 收藏

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React v 稳定版本和新增功能

react 19 正式登陆,带来了大量新功能和增强功能,可简化开发并提高应用程序性能。从改进的状态管理到更好的服务器端集成,react 19 适合每个人。


react 19 的主要特性:

1.简化异步状态管理的操作

管理 api 请求等异步操作一直是 react 中的常见挑战。 react 19 引入了 actions,它可以自动执行挂起状态、错误处理和乐观更新。

示例:使用

操作简化表单提交

import { useactionstate } from "react";

function updatenameform() {
  const [error, submitaction, ispending] = useactionstate(
    async (prevstate, formdata) => {
      const name = formdata.get("name");
      const error = await updatename(name);
      if (error) {
        return error;
      }
      redirect("/profile");
      return null;
    },
    null
  );

  return (
    <form action={submitaction}>
      &lt;input type=&quot;text&quot; name=&quot;name&quot; /&gt;
      <button type="submit" disabled={ispending}>
        update
      </button>
      {error && <p>{error}</p>}
    </form>
  );
}

这里,useactionstate 为您管理提交状态和错误处理,使代码更干净,更易于维护。


2.使用 useoptimistic 进行乐观更新

乐观的 ui 更新让用户在异步请求正在进行时立即看到更改。新的 useoptimistic 钩子使这个模式变得简单。

示例:乐观名称更改

import { useoptimistic } from "react";

function changename({ currentname, onupdatename }) {
  const [optimisticname, setoptimisticname] = useoptimistic(currentname);

  const submitaction = async (formdata) => {
    const newname = formdata.get("name");
    setoptimisticname(newname); // show optimistic state
    const updatedname = await updatename(newname); // wait for the async request
    onupdatename(updatedname); // update the actual state
  };

  return (
    <form action={submitaction}>
      <p>your name: {optimisticname}</p>
      &lt;input type=&quot;text&quot; name=&quot;name&quot; /&gt;
      <button type="submit">change name</button>
    </form>
  );
}

useoptimistic 通过在服务器响应之前显示更新来确保无缝的用户体验。


3.增强了水合不匹配的错误报告

react 19 改进了错误处理,特别是水合错误。您现在可以获得服务器和客户端之间不匹配内容的详细差异,而不是模糊的错误。

示例:水合误差差异

uncaught error: hydration failed because the server-rendered html didn’t match the client.
tree mismatch:
+ client: <span>welcome</span>
- server: <span>hello</span>

这些清晰的消息可以帮助开发人员快速有效地调试问题。


4.服务器组件和服务器操作

react 服务器组件 (rsc) 允许在服务器上渲染组件,从而提高性能。服务器操作允许直接从客户端组件调用服务器上的异步函数。

示例:使用服务器操作

// server component
export const fetchcomments = async () => {
  const response = await fetch("/api/comments");
  return await response.json();
};

// client component
import { use } from "react";

function comments({ commentspromise }) {
  const comments = use(commentspromise); // suspends until resolved
  return (
    <ul>
      {comments.map((comment) => (
        <li key={comment.id}>{comment.text}</li>
      ))}
    </ul>
  );
}

// usage
function app() {
  return (
    <suspense fallback={<p>loading comments...</p>}>
      <comments commentspromise={fetchcomments()} />
    </suspense>
  );
}

服务器操作简化了客户端组件中服务器端数据的获取和呈现。


5.本机元数据和样式表管理

react 19 现在原生支持 、<link> 和 <meta> 标签,简化了文档元数据管理。</p> <p><strong>示例:组件中的动态元数据</strong><br></p> <pre>function blogpost({ title, keywords }) { return ( <article> <h1>{title}</h1> <title>{title}</title> <meta name="keywords" content={keywords.join(", ")} /> <p>content of the blog post...</p> </article> ); } </pre> <p>react 确保这些标签自动呈现在 <head> 部分,从而提高 seo 和可用性。</p> <p><strong>示例:托管样式表</strong><br></p> <pre>function StyledComponent() { return ( <> <link rel="stylesheet" href="/styles/theme.css" precedence="high" /> <div className="styled-content">This is styled content</div> </> ); } </pre> <p>react 确保样式表以正确的顺序加载,并且仅加载一次,即使多次引用也是如此。</p> <hr><h3> <strong>为什么升级到 react 19?</strong> </h3> <p>react 19的新功能显着减少了样板代码,提高了应用程序性能,并增强了开发体验。 <strong>操作</strong>、<strong>乐观更新</strong>和<strong>服务器组件</strong>等功能使开发人员能够轻松构建动态、响应灵敏且可扩展的应用程序。</p> <hr><h3> <strong>如何升级</strong> </h3> <p>遵循 react 19 升级指南以实现平稳过渡。确保彻底测试并解决指南中概述的任何重大更改。</p> <hr><p>react 19 是一个游戏规则改变者,集简单性、强大功能和性能于一身。开始尝试这些新功能并将您的 react 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class="form-control" id="email" name="email" value="" placeholder="输入邮箱" aria-invalid="true"> </div> <div class="codeBox" style="height:70px;"> <div class="form-group" style="height:70px; width:205px; float: left;"> <input type="text" name="captcha" class="form-control" placeholder="验证码" /> </div> <span class="input-group-btn" style="padding:0;border:none;"> <a href="javascript:;" class="btn btn-primary btn-captcha cursorPointer" style="background: #2080F8; border-radius: 4px; color: #fff; padding: 12px; position: absolute;" data-url="/api/ems/send.html" data-type="email" data-event="resetpwd">发送验证码</a> </span> </div> <input type="password" class="form-control" id="newpassword" name="newpassword" value="" placeholder="请输入6-18位密码"> <div class="loginBtn mt25"> <button type="submit">重置密码</button> </div> </form> </div> </div> </div> </div> </div> </div> <script> var _hmt = _hmt || []; (function() { var hm = document.createElement("script"); hm.src = "https://hm.baidu.com/hm.js?3dc5666f6478c7bf39cd5c91e597423d"; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })(); </script> <script src="/assets/js/require.js" data-main="/assets/js/require-frontend.js?v=1671101972"></script> </body> </html>