querySelectorAll: return a NodeList containing all of the matching Element nodes within the node's subtrees, in document order. If there are no such nodes, the method must return an empty NodeList 返回指定元素节点的子树中匹配selector的节点集合,采用的是深度优化预查找;如果没有匹配的,这个方法返...
The `querySelectorAll()` method in JavaScript is used to return a static (non-live) `NodeList` of all elements that match a specified group of CSS selectors within the document. Table of Contents Syntax, Parameters, and Return Value
示例1: <body><ul id="box"><liclass="a">测试1</li><liclass="a">测试2</li><liclass="a">测试3</li></ul></body><script type="text/javascript">//获取到ul,为了之后动态的添加livarul=document.getElementById('box');//获取到现有ul里面的livarlist=ul.getElementsByTagName('li');fo...
JavaScript编程精解 中文第三版 十八、HTTP 和表单 当元素的method属性是GET(或省略)时,表单中的信息将作为查询字符串添加到action URL 的末尾。...如果我们将本例 HTML 表单中的method属性更改为POST,则浏览器会使用POST方法发送该表单,并将请求字符串放到请求正文中,而不是添加到URL 中。...因此,当 HTT...
querySelectorAll:return a NodeList containing all of the matching Element nodes within the node’s subtrees, in document order. If there are no such nodes, the method must return an empty NodeList. (返回指定元素节点的子树中匹配selector的节点集合,采用的是深度优先预查找;如果没有匹配的,这个方法...
如何在JavaScript 中从超链接中定位特定元素?这可以通过使用超链接中的目标属性来完成。...getElementsByClass() 方法:它用于获取具有给定类名的所有元素。 getElementsByTagName() : 它用于获取所有具有给定标签名称的元素。...querySelector() Method: 此函数接受 CSS 样式选择器并返回第一个选中的元素。 10. ...
The NodeList object returned by the querySelectorAll() method must be static ([DOM], section 8). 我们再看看在 Chrome 上面是个什么样的情况: document.querySelectorAll('a').toString(); // return "[object NodeList]"document.getElementsByTagName('a').toString(); // return "[object HTMLColl...
The NodeList object returned by the querySelectorAll() method must be static ([DOM], section 8). 我们再看看在 Chrome 上面是个什么样的情况: document.querySelectorAll('a').toString(); // return "[object NodeList]" document.getElementsByTagName('a').toString(); // return "[object HTMLCo...
Even though the method is invoked on an element, selectors are still evaluated in the context of the entire document. In the following example, the method will still match the div element's child p element, even though the body element is not a descendant of the div element itself. ...
querySelectorAll:return a NodeList containing all of the matching Element nodes within the node’s subtrees, in document order. If there are no such nodes, the method must return an empty NodeList. (返回指定元素节点的子树中匹配selector的节点集合,采用的是深度优先预查找;如果没有匹配的,这个方法...