<div class="main"> <div class="title"> xxx </div> <div class="A">我想要改变这里的样式（即首个class="A"的div）</div> <div class="A"></div> </div>
不用jquery，能不能做到？
回复讨论(解决方案)
你再给他设置一个class，就像这样
<div class="main"> <div class="title"> xxx </div> <div class="A div1">我想要改变这里的样式（即首个class="A"的div）</div> <div class="A"></div></div>
然后这样子写
.A.div1{color:red;}
.main .A:first-child{
background-color:yellow;
}
搞定！！
楼上正解：
:first-child 选择器用于选取属于其父元素的首个子元素的指定选择器。
正解个毛线，请问你们有测过吗，你都说了:first-child 是取其父元素的首个子元素，你确定他那样子可以？你确定他找得到？
@风中的少年 ，你确定你写对了？@转角遇到我得爱
.main:first-child .A{background-color:yellow;}这样子才对 也不对，我还是坚持我最初的方法
function getByClass(cls){ if(!document.getElementsByClassName){ return document.getElementsByClassName(cls); } else { var all = document.getElementsByTagName('*'), reg = new RegExp('(^|\\s)' + cls + '(\\s|$)'), arr = []; for (var i = 0; i < all.length; i++) { if(reg.test(all[i].className)){ arr.push(all[i]); } }; return arr; }}getByClass('A')[0].style.color = 'red';
正解个毛线，请问你们有测过吗，你都说了:first-child 是取其父元素的首个子元素，你确定他那样子可以？你确定他找得到？
@风中的少年 ，你确定你写对了？@转角遇到我得爱
哥们你能不能去测测呀
所以你改变一下方式就好了，让其成为父类的首个子元素。变通。。。。。。。
<!DOCTYPE html><html><head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Jslet - Template</title> <script src="http://apps.bdimg.com/libs/jquery/1.6.4/jquery.min.js"></script> <style> .test .A:first-child{ background-color:yellow; } </style> </head><body><div class="main"> <div class="title"> xxx </div> <div class="test"> <div class="A">我想要改变这里的样式（即首个class="A"的div）</div> <div class="A">sad</div> </div></div></body></html> 可以曲线救国：
<!doctype html><html><head><meta charset="UTF-8"><title>选择器</title><style>.main .A {color:#F00;}.main .A ~ .A {color:#000;}</style></head><body><div class="main"> <div class="title"> xxx </div> <div class="A">我想要改变这里的样式（即首个class="A"的div）</div> <div class="A">222222222</div> <div class="A">222222222</div> <div class="A">222222222</div> <div class="A">222222222</div> <div class="A">222222222</div></div></body></html> :first-child
:nth-child(1)
:first-of-type
:nth-of-type(1)
都是行不通的,
10楼写得很麻烦, 和下面效果差不多
div.A:nth-of-type(1)
但都是行不通的
<!doctype html><html><head><meta charset="UTF-8"><title>选择器</title><style>.main .A {color:#F00;}.main .A ~ .A {color:#000;}div.A:nth-of-type(1){background: green;}</style></head><body><div class="main"> <div class="title"> xxx </div> <div class="A">我想要改变这里的样式（即首个class="A"的div）</div> <div class="A">222222222</div> <div class="A">222222222</div> <div class="A">222222222</div> <div class="A">222222222</div> <div class="A">222222222</div></div><div class="main"> <div class="A">否定10楼</div> <div class="A">222222222</div> <div class="A">222222222</div> <div class="A">222222222</div> <div class="A">222222222</div> <div class="A">222222222</div></div><div> <div class="A">否定:nth-of-type(1)</div></div></body></html>
:first-child
:nth-child(1)
:first-of-type
:nth-of-type(1)
都是行不通的,
10楼写得很麻烦, 和下面效果差不多
div.A:nth-of-type(1)
但都是行不通的
[/code]
你用的是什么浏览器？
http://test.ddcat.net/test/brotherSelector.html
你用的是什么浏览器？
http://test.ddcat.net/test/brotherSelector.html
对楼主要求的理解是整个页面只能让唯一第一个 class="A" 的 div 的样式生效, 任何其他地方也生效则不符要求.
我没有找到仅用 CSS 达到要求的办法
你的方式均会让 "否定10楼" 也变成红色, 测试浏览器: chrome 44.0, firefox 39.0.3, safari 5.1.7, ie8
样式优先级问题？
1、首先优先级
内联样式表 > 内部样式表 > 外部样式表 > 浏览器缺省样式表
2、 在优先级相同时 考虑css权重值
大概就是 行内 > id > class 比较多 可以百度下慢慢研究
3、再然后就是考虑远近了
浏览器从左向右 从上到下的执行一个网页 后面的会覆盖前面的
分给我把
妈呀 有必要考虑那么深么 用内联可好
都是神啊，给第一个一个id不就可以了！！！！
都是神啊，给第一个一个id不就可以了！！！！
他就不给弄个 id, 难道去咬么??
无语
如果整个页面仅有这个一个class=A需要处理，给其一个唯一ID或 特殊 class 即可
-----------------------------------------------------
如果非要折腾，使用css选择：
如果你的 首个 class=A 始终处于 .main 的 第二个元素（ 或已知固定位置），且浏览器支持 nth-child，这个问题相对简单：
关键就是 首个 class=A 的位置是已知的，改变 nth-child(2) 即可；
1、所有.main 的第二个元素（即首个 class=A）改变样式
.main>:nth-child(2){color:#fff; background:#B32B2D;}
2、仅页面第一个.main 的第二个元素（即首个 class=A）改变样式
.main:nth-child(1)>:nth-child(2){color:#fff; background:#B32B2D;}
妈呀 有必要考虑那么深么 用内联可好
都是神啊，给第一个一个id不就可以了！！！！
居然忘了来看了，主要这个
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