> :first-child会选择.titleLeft下的第一个子元素,并应用margin-right: 20px。 >是子选择器,确保选中的是.titleLeft的直接子元素,而不是嵌套的子元素。 总结: LESS允许使用&来引用父选择器,但需要根据你想要实现的选择进行调整。 如果要选择.titleLeft元素下的第一个子元素,应该使用> :first-child。
安装了less之后后, 可以通过lessc 将单个.less文件转换为.css, 但less没有提供批量转换为css的命令, ...
:nth-child() 选中第几个元素 特殊值: 2n或even 偶数 2n+1或odd 奇数 —以上这些伪类都是根据所有的子元素进行排序 第二种写法: :first-of-type 第一个元素 :last-of-type 最后一个元素 :nth-of-type() 选中第几个元素 —功能跟上面相似,不同的是,这是在同类型的子元素中去选择 超链接 沁园春·雪...
...结合之前编写 SCSS 代码时的经验,是否可以使用:first-child 这样的选择器进行排除呢?直接在浏览器终端窗口中使用JS 语法进行了快速验证,得到的答案是可行的。...相比于 JS 中使用ID 或名称来定位页面元素的方式,这种使用CSS选择器的模式,操作起来会更的加简便和灵活。...好啦,问题也是得到了圆满的解决,此次...
p:first-child 例子:p:first-child,选择其属于父元素的首个p元素,满足条件:是否是p元素,这个p元素是否在第一个。 :last-child 例子:p:last-child,选择其属于父元素的最后一个子元素。满足条件:是否为p元素,是否在最后一个 p:first-of-type 解释:选择属于父元素的第1个p元素 ...
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