HTML中的空白节点会影响整体的HTML的版面排榜
例如：
制作百度首页时，两个input之间的空白节点将本来是要整合在一起的搜索栏硬是把按钮和搜索框分离出现好丑的间隙
这时我们就可以用js清除这个空白格
下面是HTML的代码
<form id="fm" name="f" action="post" > ???????????<span class="search_box"> ???????????????<input name="s_r" type="text" maxlength="255" class="s_r" id="s_r" > ???????????????<span class="search_box_btn"></span> ???????????</span> ???????????<span class="search_btn"> ???????????????<input type="submit" name="search" id="search" class="s_btn" value="百度一下"> ???????????</span> ???????</form>
css代码
form{ ???position: relative;}.search_box{ ???display: inline-block; ???width: 539px; ???height: 34px; ???border: 1px solid #b6b6b6; ???border-width: 1px; ???border-style:solid ; ???vertical-align: top; ???border-color:#b8b8b8 transparent #ccc #b8b8b8; ???position: relative;}.s_r{ ???width: 500px; ???height: 22px; ???font: 16px ?arial; ???line-height: 22px; ???margin: 6px 0 0 7px;}.search_box_btn{ ???position: absolute; ???width: 18px; ???height: 16px; ???background: #fff url(../image/search_box_btn.png) no-repeat; ???top: 50%; ???margin-top: -8px; ???cursor: pointer; ???right: 11px;}.search_btn{ ???display: inline-block;}.s_btn{ ???width: 100px; ???height: 36px; ???color: #fff; ???border-bottom: 1px solid #2d78f4; ???background: #3385ff;}js清除节点，为了重复利用，可以将它包装成一个函数：
function cleanWhitespace(element) ??????{ ??????????for(var i=0; i<element.childNodes.length; i++) ??????????{ ??????????????var node = element.childNodes[i]; ??????????????if(node.nodeType == 3 && !/\S/.test(node.nodeValue)) ??????????????{ ??????????????????node.parentNode.removeChild(node); ??????????????} ??????????} ??????} ?处理节点：在之后加个 cleanWhitespace(document.getElementById("fm")
问题就解决了，嘻嘻
JS 清除DOM 中空白元素节点
原文地址：https://www.cnblogs.com/masanhe/p/8989727.html