在网了一个代码，放上去，开始使用的时候，还行，不错，可是使用了一段时间后发现了问题。就是你在删除文字后，上面的字数变化就有问题，后来研究了一下，找到问题的所在。onKeyDown="showLen(this)" onKeyUp="showLen(this)以前每次只用了其中一个方法，而且没有者用，这二个方法是在你按下键盘与松开键盘的时候都进行计数，好了，我把程序放上来
New Document </pre></div> </p><p><script type="text/javascript" src="https://jss.51dongshi.net/pcwz/dysph.js"></script></div> <div class="downbox clearfix"> <div class="ico"><img src="https://js.51dongshi.net/tpl/pc2/images/document.png" alt="文档"></div> <div class="txt"> <h4>javascript记录文本框内文字个数检测文字个数变化_javascript技巧</h4> <div class="co">javascript记录文本框内文字个数检测文字个数变化_javascript技巧:最近在做一个项目中遇到这样一个问题，要对文本框中用户输入的文字进行记数，在下面显示出来，因为我们做的是一个短信发送平台，现在我们国家的短信服务，如果你的信息超过了７０个字符，短信就会按二条给你下发。所以要求我们给用户显示他输入了多少个字。好</div> <div class="tj"><b>推荐度：</b><div class="tj_stars_list"><i class="tj_stars tj_05"></i></div></div> </div> <div class="btn"> <a href="javascript:;" class="html2word" data-model="article" data-id="avhedc" title="文档下载"> <b>点击下载本文</b> <span>文档为doc格式</span> </a> </div> </div> <script>keji_detail_ga('article_content_bottom');</script> <div class="tvideo_tag"> 标签： <a href="/tlist-221/">文字</a> <a href="/tlist-10182/">文本框</a> <a href="/tlist-59738/">js</a> </div> <div class="tvideo_box tvideo_box_tab"> <div class="hd"> <ul><li class="on">热门焦点</li><script>keji_detail_ga('hot_jiaodian_tab_title');</script></ul> </div> <div class="bd"> <ul class="ult_jpic clearfix"> <script>get_hot_jiaodian_content('wz_hot_jiaodian',33,'hot',1);</script> </ul> </div> </div> </div> <!--中间文章 end--> <!--右侧专题 star--> <div class="ult_zt"> <script>keji_detail_ga('article_right_top');</script> <div class="ult_ztbox"> <h4>最新推荐</h4> <ul class="tvideo_r_a clearfix"> <script>get_detail_right('wz_right_new',33,'')</script> </ul> </div> <script>keji_detail_ga('article_right_middle');</script> <div class="ult_ztbox"> <h4>猜你喜欢</h4> <ul class="telist_rb clearfix"> <script>get_detail_right('wz_right_love',33,'')</script> </ul> </div> <script>keji_detail_ga('article_right_new_bottom');</script> <div class="ult_ztbox"> <h4>热门推荐</h4> <ul class="tvideo_r_b clearfix"> <script>get_detail_right('wz_right_hot',33,'')</script> </ul> </div> <script>keji_detail_ga('article_right_bottom');</script> </div> <!--右侧专题 end--> <div style="display:none"><a href="https://www.51dongshi.net/wzztf/av/avhedc/">专题</a> </div> </div> </div> <script src="https://js.51dongshi.net/plug/qrcode/qrcode.min.js"></script> <script src="https://js.51dongshi.net/js/share.js" charset="UTF-8"></script> <script type="text/javascript" src="https://js.51dongshi.net/tpl/pc2/js/waypoints.min.js"></script> <script type="text/javascript" src="https://js.51dongshi.net/tpl/pc2/js/icon_step.js"></script> <style> #qrcode{padding: 15px;background: #fff;} </style> <div id="qrcode" style="display: none"></div> <script>new QRCode(document.getElementById("qrcode"), "https://m.51dongshi.net/eedfavhedc.html");</script> <iframe src="https://hits.51dongshi.net/?biao=ho_article&id=975028" border="0" frameborder="0" style="width: 0px; 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