Document 查找对象方法方法描述document.getElementById(id)返回对拥有指定 id 的第一个对象的引用document.getElementsByTagName(name)返回带有指定 tag 名称的对象集合document.getElementsByClassName(name)返回带有指定 class 标签名的对象集合...
[:empty (Selectors) - CSS 中文开发手册该:empty伪类代表没有子节点的所有元素。这里只考虑元素节点和文本（包括空格）。注释或处理指令不影响元素是否被认为是空的。/* Selects any <div> that contains no content */div:empty {
background: lime;
}语法:empty实例body { d
The jQuery library supports nearly all of the selectors included in CSSspecifications 1 through 3, as outlined on the World Wide Web Consortium'ssite: http://www.w3.org/Style/CSS/specs. This support allows developersto enhance their websites without worrying about which browsers (particularlyInt
CSS 中文开发手册 类选择器 | Class selectors (Selectors) - CSS 中文开发手册 CSS 类选择器根据其class属性的内容匹配元素。 /* All elements with class="spacious" */.spacious { margin: 2em;}/* All elements with class="spacious" */li.s...
[ CSS 中文开发手册:first-of-type (Selectors) - CSS 中文开发手册该:first-of-typeCSS伪类表示其同类型的一组同胞元素中的第一个元素。/* Selects the first <p> to appear inside a parent element regardless of its position inside the si
[:only-child (Selectors) - CSS 中文开发手册该:only-childCSS伪类表示没有任何同胞元素的元素。这与:first-child:last-child或:nth-child(1):nth-last-child(1)相同的，但具有较低的特异性。/* Selects each <p>, but only if it is the *//* only ch
