我有N条或者,我怎么让它们所有的框都在输入空格或只有回车时响应alert("输入错误")???</h1></div> <div class="user-card" data-v-0c168368><div class="user-title flex align-center" data-v-21e3c89c data-v-0c168368><a href="https://blog.csdn.net/peppi" target="_blank" class="flex align-center" data-v-21e3c89c><img src="https://profile-avatar.csdnimg.cn/6bfd16ab2ac74ad4971aee33eb3de7be_peppi.jpg!1" alt class="head" data-v-21e3c89c> <span class="name" data-v-21e3c89c>peppi</span></a> <span class="cop flex1" data-v-21e3c89c>   <span class="cop-p time" data-v-21e3c89c>2002-10-18 07:23:13</span> </span> <div class="foot-btn-more" data-v-21e3c89c> </div></div></div>    <div id="blogDetail2" class="markdown_views htmledit_views" data-v-0c168368><%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql." errorPage="" %><br /> <html><br /> <head><br /> <script language="JavaScript"><br /> <br /> </script><br /> <title>Untitled Document</title><br /> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"><br /> </head><br /> <br /> <body><br /> <form action="streatment_main.jsp" method="get" name="itemform"><br /> <%<br /> for (int i = 0; i < 4; i++) //本例中i的个数是４，但实际中i的个数是不确定的<br /> {<br /> %><br /> <textarea name=<%="text" + i%>> </textarea><br /> <%<br /> }<br /> %><br /> <input type="button" onClick="check()" value="asdfaf"><br /> <input type="reset" value="reset"><br /> </form><br /> </body><br /> </html><br /> <br /> <br /> 如果是一个这样的我可以判断它是不是空格:<br /> <input name="test" type="text"><br /> 但当多个名字不一样的出现后,我就不会了,查书说有什么数组,搞不清楚怎么定位到每一个框里然后去判断是不是空格或者只有回车.<br /> 我想要的结果是,如果在里面输入只有空格或者只有回车的时候,报错.<br /> <br /> 谢谢各位了</div></div></div></div> <div class="test" data-v-0c168368> ...全文 </div> </div>      <div class="vote-outer" style="margin-bottom: 16px;" data-v-56585d28><div class="vote-content" data-v-6331320d data-v-56585d28></div></div> <div class="rates-outer flex align-items-center" data-v-756eb1fa data-v-56585d28> <div role="slider" aria-valuenow="0" aria-valuemin="0" 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data-v-d10a0ac8></i><span class="num" data-v-d10a0ac8>64</span></span> <span data-report-click="{"spm":"3001.5988"}" class="reply" data-v-d10a0ac8><i class="tool-icon icon-reply" data-v-d10a0ac8></i><span data-v-d10a0ac8>3</span></span>  <span class="pay-money" data-v-d10a0ac8><i class="tool-icon icon-pay" data-v-d10a0ac8></i><span data-v-d10a0ac8>打赏</span></span> <span data-report-click="{"spm":"3001.5987"}" class="collect" data-v-d10a0ac8><i class="tool-icon icon-collect" data-v-d10a0ac8></i>收藏</span> <div class="handle-item share" data-v-ca030a68 data-v-d10a0ac8><span height="384" data-v-ca030a68><div role="tooltip" id="el-popover-2741" aria-hidden="true" class="el-popover el-popper popo share-popover" style="width:265px;display:none;"><div id="tool-QRcode" class="QRcode" data-v-ca030a68><img src="https://csdnimg.cn/release/cmsfe/public/img/shareBg4.515d57f6.png" alt="" class="share-bg" data-v-ca030a68> <div class="share-bg-box" data-v-ca030a68><div class="share-content" 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alt="" class="close"></div></div><div class="el-dialog__footer"><span class="dialog-footer"><div class="pay-number"><span>需支付:</span> <span>0.00 </span> <span>元</span></div> <button type="button" class="el-button el-button--default el-button--middle"><span>取消</span></button> <button type="button" class="el-button el-button--primary disable submit"><span>确定</span></button></span></div></div></div></div> <div class="comment-box" data-v-aeae4ab6><div id="commentMsgId" class="commentMsg" data-v-395b6e48 data-v-aeae4ab6><div data-v-395b6e48><div id="12039002" class="comment-item" data-v-395b6e48><div class="comment-box" data-v-395b6e48><div class="head-img" data-v-395b6e48><a target="_blank" href="https://blog.csdn.net/qiushuiwuhen" data-v-395b6e48><img src="https://profile-avatar.csdnimg.cn/default.jpg!1" alt data-v-395b6e48></a></div> <div class="comment-main" data-v-395b6e48><div class="user-msg" data-v-395b6e48><div class="info-card" data-v-395b6e48><span class="name" data-v-395b6e48><a target="_blank" href="https://blog.csdn.net/qiushuiwuhen" class="name" data-v-395b6e48>qiushuiwuhen</a>   <span class="time" data-v-395b6e48>2002-10-19</span></span> </div> <div class="user-operate clearTpaErr" data-v-395b6e48><span class="operate" data-v-395b6e48><i class="icon icon-operate" data-v-395b6e48></i> <div class="option-box" data-v-395b6e48><ul class="ul-box" data-v-395b6e48><li data-v-395b6e48>打赏</li><li data-v-395b6e48>举报</li></ul></div></span> <span data-report-click="{"spm":"3001.5991"}" class="reply" data-v-395b6e48><i class="icon icon-reply" data-v-395b6e48></i> <span data-v-395b6e48>回复</span></span>   <span data-report-click="{"spm":"3001.5992"}" class="love" data-v-395b6e48> <i class="icon" data-v-395b6e48></i></span></div></div> <div class="comment-msg" data-v-395b6e48><div class="msg" data-v-395b6e48> <span id="text-12039002" class="text rich-text blog-content-box htmledit_views markdown_views" data-v-395b6e48><html><br /> <head><br /> <script language="JavaScript"><br /> <br /> var o=document.getElementsByTagName("textarea");<br /> for(i=0;i<o.length;i++){<br /> if(/^text/.test(o[i].name)&&!/\S/.test(o[i].value)){<br /> alert("输入错误");o[i].select();return;<br /> }<br /> }<br /> }<br /> --><br /> </script><br /> <title>Untitled Document</title><br /> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"><br /> </head><br /> <br /> <body><br /> <form action="streatment_main.jsp" method="get" name="itemform"><br /> <textarea name=text0> </textarea><br /> <textarea name=text1> </textarea><br /> <textarea name=text2> </textarea><br /> <textarea name=text3> </textarea><br /> <input type="button" onClick="check()" value="asdfaf"><br /> <input type="reset" value="reset"><br /> </form><br /> </body><br /> </html></span></div></div> </div></div> <div class="comment-child flat-child" data-v-395b6e48></div></div><div id="12038982" class="comment-item" data-v-395b6e48><div class="comment-box" data-v-395b6e48><div class="head-img" data-v-395b6e48><a target="_blank" href="https://blog.csdn.net/saucer" data-v-395b6e48><img src="https://profile-avatar.csdnimg.cn/default.jpg!1" alt data-v-395b6e48></a></div> <div class="comment-main" data-v-395b6e48><div class="user-msg" data-v-395b6e48><div class="info-card" data-v-395b6e48><span class="name" data-v-395b6e48><a target="_blank" href="https://blog.csdn.net/saucer" class="name" data-v-395b6e48>saucer</a>   <span class="time" data-v-395b6e48>2002-10-19</span></span> </div> <div class="user-operate clearTpaErr" data-v-395b6e48><span class="operate" data-v-395b6e48><i class="icon icon-operate" data-v-395b6e48></i> <div class="option-box" data-v-395b6e48><ul class="ul-box" data-v-395b6e48><li data-v-395b6e48>打赏</li><li data-v-395b6e48>举报</li></ul></div></span> <span data-report-click="{"spm":"3001.5991"}" class="reply" data-v-395b6e48><i class="icon icon-reply" data-v-395b6e48></i> <span data-v-395b6e48>回复</span></span>   <span data-report-click="{"spm":"3001.5992"}" class="love" data-v-395b6e48> <i class="icon" data-v-395b6e48></i></span></div></div> <div class="comment-msg" data-v-395b6e48><div class="msg" data-v-395b6e48> <span id="text-12038982" class="text rich-text blog-content-box htmledit_views markdown_views" data-v-395b6e48>try<br /> <br /> <script language="javascript"><br /> function check()<br /> {<br /> var elements = document.itemform.elements;<br /> for (var i=0; i < elements.length; i++)<br /> {<br /> if ((elements[i].tagName == "INPUT" && elements[i].type == "text") || elements[i].tagName == "TEXTAREA")<br /> if (elements[i].value.replace(/^\s+|\s+$/g,"") == "")<br /> {<br /> alert("输入错误:" + elements[i].name + " cannot be empty");<br /> elements[i].focus();<br /> return;<br /> }<br /> }<br /> }<br /> </script></span></div></div> </div></div> <div class="comment-child flat-child" data-v-395b6e48></div></div><div id="12038876" class="comment-item" data-v-395b6e48><div class="comment-box" data-v-395b6e48><div class="head-img" data-v-395b6e48><a target="_blank" href="https://blog.csdn.net/danky" data-v-395b6e48><img src="https://profile-avatar.csdnimg.cn/default.jpg!1" alt data-v-395b6e48></a></div> <div class="comment-main" data-v-395b6e48><div class="user-msg" data-v-395b6e48><div class="info-card" data-v-395b6e48><span class="name" data-v-395b6e48><a target="_blank" href="https://blog.csdn.net/danky" class="name" data-v-395b6e48>烂笔头Danky</a>   <span class="time" data-v-395b6e48>2002-10-19</span></span> </div> <div class="user-operate clearTpaErr" data-v-395b6e48><span class="operate" data-v-395b6e48><i class="icon icon-operate" data-v-395b6e48></i> <div class="option-box" data-v-395b6e48><ul class="ul-box" data-v-395b6e48><li data-v-395b6e48>打赏</li><li data-v-395b6e48>举报</li></ul></div></span> <span data-report-click="{"spm":"3001.5991"}" class="reply" data-v-395b6e48><i class="icon icon-reply" data-v-395b6e48></i> <span data-v-395b6e48>回复</span></span>   <span data-report-click="{"spm":"3001.5992"}" class="love" data-v-395b6e48> <i class="icon" data-v-395b6e48></i></span></div></div> <div class="comment-msg" data-v-395b6e48><div class="msg" data-v-395b6e48> <span id="text-12038876" class="text rich-text blog-content-box htmledit_views markdown_views" data-v-395b6e48>对于判断空格我向你提个想法：如果是想判断是否输入的全为空格的话，可以每个地取出输入的值进行比较，如：<br /> <input name="test" type="text"><button onclick=check(test)>确定</button><br /> <script><br /> function check(inputObj){<br /> var temp=0;<br /> for(var i=0; i<inputObj.value.length; i++){<br /> if(inputObj.value.charAt(i)==" "||inputObj.value.charAt(i)=="　“) temp++;<br /> }<br /> if(temp!=0) alert("请输入数据！");<br /> }<br /> </script><br /> <br /> 这例子不太完善，只供参考参考，至于回车的我还没有想到！</span></div></div> </div></div> <div class="comment-child flat-child" data-v-395b6e48></div></div> </div> </div> </div> </div> <xg-player examineInfo="[object Object]" optionsConfig="[object Object]" data-v-4a5a7f56></xg-player> <div class="recommendList" 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href="https://download.csdn.net/download/qq_36462452/91403582" data-report-click="{"mod":"popu_645","index":"4","dest":"https://download.csdn.net/download/qq_36462452/91403582","strategy":"2~default~BlogCommendHotData~Rate","extra":"{\"utm_medium\":\"distribute.pc_relevant_bbs_down_v2.none-task-download-2~default~BlogCommendHotData~Rate-4-91403582-bbs-20050838.264^v3^pc_relevant_bbs_down_v2_default\",\"dist_request_id\":\"1752880590211_36235\"}","spm":"1035.2023.3001.6557"}" data-report-query="spm=1035.2023.3001.6557&utm_medium=distribute.pc_relevant_bbs_down_v2.none-task-download-2~default~BlogCommendHotData~Rate-4-91403582-bbs-20050838.264^v3^pc_relevant_bbs_down_v2_default&depth_1-utm_source=distribute.pc_relevant_bbs_down_v2.none-task-download-2~default~BlogCommendHotData~Rate-4-91403582-bbs-20050838.264^v3^pc_relevant_bbs_down_v2_default" class="desc" data-v-ca2d15ac>1、压缩文件中包含：中文文档、jar包下载地址、Maven依赖、Gradle依赖、源代码下载地址。 2、使用方法：解压最外层zip，再解压其中的zip包，双击【index.html】文件，即可用浏览器打开、进行查看。 3、特殊说明：（1）本文档为人性化翻译，精心制作，请放心使用；（2）只翻译了该翻译的内容，如：注释、说明、描述、用法讲解等；（3）不该翻译的内容保持原样，如：类名、方法名、包名、类型、关键字、代码等。 4、温馨提示：（1）为了防止解压后路径太长导致浏览器无法打开，推荐在解压<em>时</em>选择“解压到当前文件夹”（放心，自带文件夹，文件不会散落一地）；（2）有<em>时</em>，一套Java组件会有多个jar，所以在下载前，请仔细阅读本篇描述，以确保这就是你需要的文件。 5、本文件关键字： jar中文文档.zip,java,jar包,Maven,第三方jar包,组件,开源组件,第三方组件,Gradle,中文API文档,手册,开发手册,使用手册,参考手册。</a></div><div data-report-view="{"mod":"popu_645","index":"5","dest":"https://download.csdn.net/download/qq_36462452/91403612","strategy":"2~default~BlogCommendHotData~Rate","extra":"{\"utm_medium\":\"distribute.pc_relevant_bbs_down_v2.none-task-download-2~default~BlogCommendHotData~Rate-5-91403612-bbs-20050838.264^v3^pc_relevant_bbs_down_v2_default\",\"dist_request_id\":\"1752880590211_36235\"}","spm":"1035.2023.3001.6557"}" class="list-item" data-v-ca2d15ac><div class="recommend-title" data-v-ca2d15ac><img 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