javascript – 在React / Redux reducer中,如何以不可变的方式更新嵌套数组中的字符串？

我的商店看起来像这样,

{
  name: "john",foo: {},arr: [
      {
        id:101,desc:'comment'
      },{ 
        id:101,desc:'comment2'
      }
    ]
}

我的textarea看起来像这样

</pre>
<p>我的行动是</p>
<p></p>
<pre><code>export const onChng = (desc) => ({
  type: Constants.SET_DESC,payload: {
    desc
  }
});
</code></pre>
<p>我的减速机</p>
<p></p>
<pre><code>case Constants.SET_DESC:
  return update(state,{
    store: {
      streams: {
        desc: { $set: action.payload.desc }
      } 
    }
});
</code></pre>
<p>它只有在arry是一个对象时才有效,我不得不对数组流进行更改,我很困惑如何更新到数组,以及如何从商店中<a href="https://www.jb51.cc/tag/huoqu/" target="_blank" class="keywords">获取</a>正确的值.</div>
<div class='answers_count'>最佳答案</div>
<div class='answers'>要更新数组,我会使用<a href="http://redux.js.org/docs/recipes/reducers/ImmutableUpdatePatterns.html" rel="nofollow noreferrer">immutability helper</a>并执行类似这样的操作 – 到您的reducer</p>
<p></p>
<pre><code> let store = {"state" : {
"data": [{
    "subset": [{
        "id": 1
    },{
        "id": 2
    }]
},{
    "subset": [{
        "id": 10
    },{
        "id": 11
    },{
        "id": 12
    }]
}]
}}

case Constants.SET_DESC:
  return update(store,{
  "state" : {
  "data": {
      [action.indexToUpdate]: {
        "subset": {
             $set: action.payload.desc
        }
      }
  }
 }
  })
  });
</code></pre>
</div>
<!-- jb51.cc --><i class="glyphicon glyphicon-link"></i> 原文链接：https://www.f2er.com/js/429200.html</div>
      <div class="topcard-tags"><a href="https://www.f2er.com/tag/arrays/" class="tag_link" target="_blank">arrays</a><a href="https://www.f2er.com/tag/parrays/" class="tag_link" target="_blank">arrays</a><a href="https://www.f2er.com/tag/arraysp/" class="tag_link" target="_blank">arrays</a></div>
      
                 <ul class="list-group">
        <li class="list-group-item"><a href="https://www.f2er.com/js/429201.html" title="javascript  – 如何对大于和小于考虑的内容进行排序？">上一篇：javascript  – 如何对大于和小于考</a><a href="https://www.f2er.com/js/429199.html" title="javascript  – 使用truncate.js截断多行html文本" class="text-muted pull-right">下一篇：javascript  – 使用truncate.js截</a>
    
    </li>
    </ul>
              </div>
            </div>
          </div>
          <!-- row end -->
          
          <div class="row row-sm">
            <div class="col-sm-12 col-md-12 col-lg-12">
              <div class="card">
<ins class="adsbygoogle"
     style="display:block"
     data-ad-format="autorelaxed"
     data-ad-client="ca-pub-4605373693034661"
     data-ad-slot="9144498553"></ins>
<script>
     (adsbygoogle = window.adsbygoogle || []).push({});
</script></div>
            </div>
          </div>

          <div class="row row-sm">
            <div class="col-sm-12 col-md-12 col-lg-12">
              <div class="card">
                  
    <div class="title"><h1>猜你在找的JavaScript相关文章</h1></div>
<div class="list_con">
                                    <a href="https://www.f2er.com/js/997747.html" title="Javascript中的事件冒泡与捕获"><div class="title">Javascript中的事件冒泡与捕获</div>
                                <div class="summary">事件冒泡和事件捕获 起因：今天在封装一个bind函数的时候，发现el.addEventListener函数支...</div>
                                <time class="summary">作者：前端之家 时间：2021-02-22</time>
                                </a>
                            </div>
<div class="list_con">
                                    <a href="https://www.f2er.com/js/997746.html" title="搞懂js中小数运算精度问题原因及解决办法"><img class="lazy" src="https://www.f2er.com/images/np.jpg" data-original="https://www.f2er.com/res/2021/02-22/19/e40e1eb184cb2a5d8c5f6c5e730d8e82.png" title="" width="160" height="90" style="float:right;margin-left:30px;display:none;" /><div class="title">搞懂js中小数运算精度问题原因及解决办法</div>
                                <div class="summary">js小数运算会出现精度问题 js number类型 JS 数字类型只有number类型，number类型相当于其...</div>
                                <time class="summary">作者：前端之家 时间：2021-02-22</time>
                                </a>
                            </div>
<div class="list_con">
                                    <a href="https://www.f2er.com/js/997744.html" title="搞懂：前端跨域问题JS解决跨域问题VUE代理解决跨域问题原理"><div class="title">搞懂：前端跨域问题JS解决跨域问题VUE代理解决跨域问题原理</div>
                                <div class="summary">什么是跨域 跨域 ： 广义的跨域包含一下内容 ： 1.资源跳转（链接跳转，重定向跳转，表单提...</div>
                                <time class="summary">作者：前端之家 时间：2021-02-22</time>
                                </a>
                            </div>
<div class="list_con">
                                    <a href="https://www.f2er.com/js/997743.html" title="前端对base64编码的理解，原生js实现字符base64编码"><div class="title">前端对base64编码的理解，原生js实现字符base64编码</div>
                                <div class="summary">@ &quot;TOC&quot; 常见对base64的认知(不完全正确) 首先对base64常见的认知，也是...</div>
                                <time class="summary">作者：前端之家 时间：2021-02-22</time>
                                </a>
                            </div>
<div class="list_con">
                                    <a href="https://www.f2er.com/js/997742.html" title="搞懂：MVVM模型以及VUE中的数据绑定数据劫持发布订阅模式"><div class="title">搞懂：MVVM模型以及VUE中的数据绑定数据劫持发布订阅模式</div>
                                <div class="summary">搞懂：MVVM模式和Vue中的MVVM模式 MVVM MVVM ： 的缩写，说都能直接说出来 ：模型， ：视图...</div>
                                <time class="summary">作者：前端之家 时间：2021-02-22</time>
                                </a>
                            </div>
<div style="border-bottom: 1px solid #f4f4f4;margin-top:20px;">
<ins class="adsbygoogle"
     style="display:block"
     data-ad-format="fluid"
     data-ad-layout-key="-fr-2o+fp-dx-wx"
     data-ad-client="ca-pub-4605373693034661"
     data-ad-slot="4561116489"></ins>
<script>
     (adsbygoogle = window.adsbygoogle || []).push({});
</script>
</div><div class="list_con">
                                    <a href="https://www.f2er.com/js/997318.html" title="js判断浏览器是否支持webGL"><div class="title">js判断浏览器是否支持webGL</div>
                                <div class="summary">起因是我之前开发的网页，用到了three.js制作了一个3d的旋转球体效果。 在各种浏览器上运行...</div>
                                <time class="summary">作者：前端之家 时间：2021-02-14</time>
                                </a>
                            </div>
<div class="list_con">
                                    <a href="https://www.f2er.com/js/997317.html" title="js判断undefined和null"><div class="title">js判断undefined和null</div>
                                <div class="summary">js判断undefined js判断null js判断null和undefined</div>
                                <time class="summary">作者：前端之家 时间：2021-02-14</time>
                                </a>
                            </div>
<div class="list_con">
                                    <a href="https://www.f2er.com/js/997316.html" title="将文字自动转为banner打印形式的工具"><div class="title">将文字自动转为banner打印形式的工具</div>
                                <div class="summary">http://patorjk.com/software/taag/</div>
                                <time class="summary">作者：前端之家 时间：2021-02-14</time>
                                </a>
                            </div>
<div class="list_con">
                                    <a href="https://www.f2er.com/js/997315.html" title="聊一聊 bootstrap 的轮播图插件"><div class="title">聊一聊 bootstrap 的轮播图插件</div>
                                <div class="summary">今天做工作的时候，轻车熟路的做完，又用到了bootstrap的轮播图，觉得有必要安利一下这个插...</div>
                                <time class="summary">作者：前端之家 时间：2021-02-14</time>
                                </a>
                            </div>
<div class="list_con">
                                    <a href="https://www.f2er.com/js/997314.html" title="js实现图片无缝循环跑马灯"><div class="title">js实现图片无缝循环跑马灯</div>
                                <div class="summary">html 代码 css js代码 function mylsRunHorseLight() { if (mylsTimer != null) { clearIn...</div>
                                <time class="summary">作者：前端之家 时间：2021-02-14</time>
                                </a>
                            </div>
<div style="border-bottom: 1px solid #f4f4f4;margin-top:20px;">
<ins class="adsbygoogle"
     style="display:block"
     data-ad-format="fluid"
     data-ad-layout-key="-fr-2o+fp-dx-wx"
     data-ad-client="ca-pub-4605373693034661"
     data-ad-slot="4561116489"></ins>
<script>
     (adsbygoogle = window.adsbygoogle || []).push({});
</script>
</div></div>
            </div>
          </div>
        </div>
        <!-- left end-->
        
        <!-- right -->
        <div class="col-sm-12 col-md-12 col-lg-3">
          <!-- row -->
          <div class="row row-sm">
            <div class="col-sm-12 col-md-12 col-lg-12">
              <div class="card">
                <label class="main-content-label ">编程分类</label>
                <div class="cate mt-20"><a href="https://www.f2er.com/html/" title="HTML">HTML</a><a href="https://www.f2er.com/html5/" title="HTML5">HTML5</a><a href="https://www.f2er.com/js/" title="JavaScript">JavaScript</a><a href="https://www.f2er.com/css/" title="CSS">CSS</a><a href="https://www.f2er.com/jquery/" title="jQuery">jQuery</a><a href="https://www.f2er.com/bootstrap/" title="Bootstrap">Bootstrap</a><a href="https://www.f2er.com/angularjs/" title="Angularjs">Angularjs</a><a href="https://www.f2er.com/typescript/" title="TypeScript">TypeScript</a><a href="https://www.f2er.com/vue/" title="Vue">Vue</a><a href="https://www.f2er.com/dojo/" title="Dojo">Dojo</a><a href="https://www.f2er.com/json/" title="Json">Json</a><a href="https://www.f2er.com/electron/" title="Electron">Electron</a><a href="https://www.f2er.com/nodejs/" title="Node.js">Node.js</a><a href="https://www.f2er.com/extjs/" title="extjs">extjs</a><a href="https://www.f2er.com/express/" title="Express ">Express </a><a href="https://www.f2er.com/xml/" title="XML">XML</a><a href="https://www.f2er.com/es6/" title="ES6">ES6</a><a href="https://www.f2er.com/ajax/" title="Ajax">Ajax</a><a href="https://www.f2er.com/flash/" title="Flash">Flash</a><a href="https://www.f2er.com/unity/" title="Unity">Unity</a><a href="https://www.f2er.com/react/" title="React">React</a><a href="https://www.f2er.com/flex/" title="Flex">Flex</a><a href="https://www.f2er.com/antdesign/" title="Ant Design">Ant Design</a><a href="https://www.f2er.com/webfrontend/" title="Web前端">Web前端</a><a href="https://www.f2er.com/weapp/" title="微信小程序">微信小程序</a><a href="https://www.f2er.com/wxmp/" title="微信公众号">微信公众号</a><div class="clearfix"></div>
                </div>
              </div>
            </div>
          </div>
          <!-- row end -->
         <!-- row -->
          <div class="row row-sm">
            <div class="col-sm-12 col-md-12 col-lg-12">
              <div class="card"> 
<!-- f2er-rightads -->
<ins class="adsbygoogle"
     style="display:block"
     data-ad-client="ca-pub-4605373693034661"
     data-ad-slot="7756441254"
     data-ad-format="auto"
     data-full-width-responsive="true"></ins>
<script>
     (adsbygoogle = window.adsbygoogle || []).push({});
</script>
              </div>
            </div>
          </div>
          <!-- row end -->
          
          <!-- row -->
          <div class="row row-sm">
            <div class="col-sm-12 col-md-12 col-lg-12">
              <div class="card">
                <label class="main-content-label ">最新文章</label>
                <ul class="n-list"><li><a href="https://www.f2er.com/js/997747.html" title="Javascript中的事件冒泡与捕获" target="_blank">• Javascript中的事件冒泡与</a></li>
<li><a href="https://www.f2er.com/js/997746.html" title="搞懂js中小数运算精度问题原因及解决办法" target="_blank">• 搞懂js中小数运算精度问题</a></li>
<li><a href="https://www.f2er.com/js/997744.html" title="搞懂：前端跨域问题JS解决跨域问题VUE代理解决跨域问题原理" target="_blank">• 搞懂：前端跨域问题JS解决</a></li>
<li><a href="https://www.f2er.com/js/997743.html" title="前端对base64编码的理解，原生js实现字符base64编码" target="_blank">• 前端对base64编码的理解，</a></li>
<li><a href="https://www.f2er.com/js/997742.html" title="搞懂：MVVM模型以及VUE中的数据绑定数据劫持发布订阅模式" target="_blank">• 搞懂：MVVM模型以及VUE中的</a></li>
<li><a href="https://www.f2er.com/js/997493.html" title="js实现横向跑马灯效果" target="_blank">• js实现横向跑马灯效果</a></li>
<li><a href="https://www.f2er.com/js/997318.html" title="js判断浏览器是否支持webGL" target="_blank">• js判断浏览器是否支持webG</a></li>
<li><a href="https://www.f2er.com/js/997317.html" title="js判断undefined和null" target="_blank">• js判断undefined和null</a></li>
<li><a href="https://www.f2er.com/js/997316.html" title="将文字自动转为banner打印形式的工具" target="_blank">• 将文字自动转为banner打印</a></li>
<li><a href="https://www.f2er.com/js/997315.html" title="聊一聊 bootstrap 的轮播图插件" target="_blank">• 聊一聊 bootstrap 的轮播图</a></li>
</ul>
              </div>
            </div>
          </div>
          <!-- row end -->


          <!-- row -->
          <div class="row row-sm">
            <div class="col-sm-12 col-md-12 col-lg-12">
              <div class="card">
                <label class="main-content-label ">热门标签
                  <span class="pull-right tx-12">
                    <a href="https://www.f2er.com/all" target="_blank">更多 ►</a></span>
                </label>
                <div class="topcard-tags"><a href="https://www.f2er.com/tag/guanbiyangao/" title="关闭广告" target="_blank">关闭广告</a><a href="https://www.f2er.com/tag/danduheaders/" title="单独headers" target="_blank">单独headers</a><a href="https://www.f2er.com/tag/fengzhuangdaima/" title="封装代码" target="_blank">封装代码</a><a href="https://www.f2er.com/tag/tishicuowu/" title="提示错误" target="_blank">提示错误</a><a href="https://www.f2er.com/tag/zhengshuzhengze/" title="整数正则" target="_blank">整数正则</a><a href="https://www.f2er.com/tag/fei0kaitou/" title="非0开头" target="_blank">非0开头</a><a href="https://www.f2er.com/tag/tiaoye/" title="跳页" target="_blank">跳页</a><a href="https://www.f2er.com/tag/chuyema/" title="出页码" target="_blank">出页码</a><a href="https://www.f2er.com/tag/antdtable/" title="antd table" target="_blank">antd table</a><a href="https://www.f2er.com/tag/tishiURLweizhuce/" title="提示URL未注册" target="_blank">提示URL未注册</a><a href="https://www.f2er.com/tag/gongzhonghaozhifu/" title="公众号支付" target="_blank">公众号支付</a><a href="https://www.f2er.com/tag/vuehashmoshi/" title="vue hash模式" target="_blank">vue hash模式</a><a href="https://www.f2er.com/tag/iSlider/" title="iSlider" target="_blank">iSlider</a><a href="https://www.f2er.com/tag/chepaijianpan/" title="车牌键盘" target="_blank">车牌键盘</a><a href="https://www.f2er.com/tag/xunhuantupian/" title="循环图片" target="_blank">循环图片</a><a href="https://www.f2er.com/tag/echartsshuangzhexian/" title="echarts 双折线" target="_blank">echarts 双折</a><a href="https://www.f2er.com/tag/zuoyoubuju/" title="左右布局" target="_blank">左右布局</a><a href="https://www.f2er.com/tag/DllPlugin/" title="DllPlugin" target="_blank">DllPlugin</a><a href="https://www.f2er.com/tag/duixiangchuangjian/" title="对象创建" target="_blank">对象创建</a><a href="https://www.f2er.com/tag/daziyouxi/" title="打字游戏" target="_blank">打字游戏</a><a href="https://www.f2er.com/tag/quanxuan/" title="圈选" target="_blank">圈选</a><a href="https://www.f2er.com/tag/lianglan/" title="两栏" target="_blank">两栏</a><a href="https://www.f2er.com/tag/yunhanshu/" title="云函数" target="_blank">云函数</a><a href="https://www.f2er.com/tag/mengban/" title="蒙版" target="_blank">蒙版</a><a href="https://www.f2er.com/tag/ES2020/" title="ES2020" target="_blank">ES2020</a><a href="https://www.f2er.com/tag/chuchuang/" title="橱窗" target="_blank">橱窗</a><a href="https://www.f2er.com/tag/wufenggundonglunbo/" title="无缝滚动轮播" target="_blank">无缝滚动轮播</a><a href="https://www.f2er.com/tag/sekuaipengzhuang/" title="色块碰撞" target="_blank">色块碰撞</a><a href="https://www.f2er.com/tag/zujianxiaohui/" title="组件销毁" target="_blank">组件销毁</a><a href="https://www.f2er.com/tag/wendangcaozuo/" title="文档操作" target="_blank">文档操作</a></div>
              </div>
            </div>
          </div>
          <!-- row end -->
          
          
         <!-- row -->
          <div class="row row-sm">
            <div class="col-sm-12 col-md-12 col-lg-12">
              <div class="card"> 
<!-- f2er-rightads -->
<ins class="adsbygoogle"
     style="display:block"
     data-ad-client="ca-pub-4605373693034661"
     data-ad-slot="7756441254"
     data-ad-format="auto"
     data-full-width-responsive="true"></ins>
<script>
     (adsbygoogle = window.adsbygoogle || []).push({});
</script>
              </div>
            </div>
          </div>
          <!-- row end -->
          
          </div>
        <!-- right end -->
        </div>
    </div>

     <footer id="footer">
    <div class="container">
        <div class="row hidden-xs">
             <dl class="col-sm-6 site-link">
                <dt>最近更新</dt><dd><a href="https://www.f2er.com/faq/884225.html" title="jQuery选择伪元素：after" target="_blank">· jQuery选择伪元素：after</a><span class="text-muted pull-right">10-20</span></dd>
<dd><a href="https://www.f2er.com/faq/884224.html" title="JavaScript随机颜色生成器" target="_blank">· JavaScript随机颜色生成器</a><span class="text-muted pull-right">10-20</span></dd>
<dd><a href="https://www.f2er.com/faq/884223.html" title="JavaScript指数" target="_blank">· JavaScript指数</a><span class="text-muted pull-right">10-20</span></dd>
<dd><a href="https://www.f2er.com/faq/884222.html" title="addResourceHandlers无法解析静态资源" target="_blank">· addResourceHandlers无法解析静态资源</a><span class="text-muted pull-right">10-20</span></dd>
<dd><a href="https://www.f2er.com/faq/884221.html" title="如何将字节数组转换为MultipartFile" target="_blank">· 如何将字节数组转换为MultipartFile</a><span class="text-muted pull-right">10-20</span></dd>
<dd><a href="https://www.f2er.com/faq/884220.html" title="在java中如何创建一个文件并写入内容？" target="_blank">· 在java中如何创建一个文件并写入内容？</a><span class="text-muted pull-right">10-20</span></dd>
<dd><a href="https://www.f2er.com/faq/884219.html" title="星号*在Python中是什么意思？" target="_blank">· 星号*在Python中是什么意思？</a><span class="text-muted pull-right">10-20</span></dd>
<dd><a href="https://www.f2er.com/faq/884218.html" title="Flask框架：MVC模式" target="_blank">· Flask框架：MVC模式</a><span class="text-muted pull-right">10-20</span></dd>
<dd><a href="https://www.f2er.com/faq/884217.html" title="在JavaScript对象数组中按ID查找对象" target="_blank">· 在JavaScript对象数组中按ID查找对象</a><span class="text-muted pull-right">10-20</span></dd>
<dd><a href="https://www.f2er.com/faq/884216.html" title="使用Javascript / jQuery下载文件" target="_blank">· 使用Javascript / jQuery下载文件</a><span class="text-muted pull-right">10-20</span></dd>
</dl>
            
           <dl class="col-sm-4 site-link">
                <dt>好站推荐</dt><dd> <a href="https://www.runoob.com" title="菜鸟教程(www.runoob.com)提供了编程的基础技术教程, 介绍了HTML、CSS、Javascript、Python，Java，Ruby，C，PHP , MySQL等各种编程语言的基础知识。 同时本站中也提供了大量的在线实例，通过实例，您可以更好的学习编程。" target="_blank">菜鸟教程</a></dd><dd> <a href="https://www.jb51.cc" title="编程之家(www.jb51.cc)是成立于2017年面向全球中文开发者的技术内容分享平台。提供编程导航、编程问答、编程博文、编程百科、编程教程、编程工具、编程实例等开发者最需要的编程技术内容与开发工具支持，与你一起学习编程，相信编程改变未来！" target="_blank">编程之家</a></dd><dd> <a href="https://www.f2er.com" title="前端之家 f2er.com 前端开发人员所需学习知识手册。" target="_blank">前端之家</a></dd></dl>

            <dl class="col-sm-2 site-link">
                <dt>商务合作</dt>
                <dd><a target="_blank" href="http://wpa.qq.com/msgrd?v=3&uin=76874919&site=qq&menu=yes">联系我们</a></dd>
            </dl>

        </div>
        <div class="copyright">
            Copyright © 2019 前端之家. 当前版本 V7.0.16<br>
            <span class="ml5">前端之家 版权所有 
            <a href="https://beian.miit.gov.cn/"  target="_blank"  rel="nofollow">闽ICP备13020303号-10</a></span>
        </div>
    </div>
</footer>
<script type="text/javascript" src="https://www.f2er.com/js/base.js"></script>
</body>
</html>