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>62</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-7516" 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/shareBg3.9519d347.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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<em>input</em>标签是HTML中用来定义表单中<em>输入</em><em>框</em>的标签，它可以用来接收用户<em>输入</em>的数据。<em>input</em>标签的type属性可以设置不同的<em>输入</em>类型，如文本<em>框</em>、密码<em>框</em>、单选<em>框</em>、复选<em>框</em>等。除了type属性，<em>input</em>标签还有许多其他属性，如name、value、placeholder等，用来定义<em>输入</em><em>框</em>的名称、默认值、提示信息等。</a></div><div data-report-view="{"mod":"popu_645","index":"5","dest":"https://blog.csdn.net/elong490/article/details/46380333","strategy":"2~default~OPENSEARCH~Rate","extra":"{\"utm_medium\":\"distribute.pc_relevant_bbs_down_v2.none-task-blog-2~default~OPENSEARCH~Rate-5-46380333-bbs-20050838.264^v3^pc_relevant_bbs_down_v2_opensearchbbsnew\",\"dist_request_id\":\"1752237137119_46722\"}","spm":"1035.2023.3001.6557"}" class="list-item" data-v-ca2d15ac><div class="recommend-title" data-v-ca2d15ac><img 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