var elements = new Array(); for (var ii = 0; ii < children.length; ii++) { var child = children[ii]; var classNames = child.className.split(' '); for (var j = 0; j < classNames.length; j++) { if (classNames[j] =
*/ /* obtain elements : there are three functions can obtain element nodes => via id, tag name, class name;*/ console.log(typeof document.getElementById("purchases")); /* It will show "object" in browser */ console.log(document.getElementsByTagName("li").length); /* this function...
1.通过元素ID属性的ID值来获得元素对象-getElementById() DOM提供了一个名为getElementById()的方法,这个方法将返回一个与括号里有着一样id值的元素节点对应的对象。他是document对象特有的函数,这个函数的参数只有一个,只能是你想要获得的元素的ID值,这个值必须放在单引号或者双引号里面。 注意:JavaScript语言区分...
const elements = document.getElementsByTagName("p");4.document.getElementsByClassName(className): 通...
The most recent technique, to be popularized, was the use of XPath to find elements by classname. The implementation is generally simple: Building a single expressions and letting the XPath engine traverse through the document, finding all the relevant elements. ...
getElementById('myElementId'); 2. 通过类名获取元素 如果你想获取具有特定类名的所有元素,可以使用getElementsByClassName方法。请注意,这个方法返回的是一个NodeList对象,包含所有匹配的元素。 var elements = document.getElementsByClassName('myClassName'); 3. 通过标签名获取元素 如果你想获取特定标签名的所有...
if ( pattern.test(els[i].className) ) { classElements[j] = els[i]; j++; } } return classElements; } 扩展阅读: document.getElementsByClassName理想实现 querySelector()方法 W3C标准的Selector API Level1中提供了两个核心的方法querySelector()和querySelectorAll(), 可以通过Document对象或者基于现有...
varparagraphs=document.getElementsByTagName("p"); 使用document.getElementsByClassName方法:使用类名获取元素的集合。例如: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 varelements=document.getElementsByClassName("myClass"); 这些方法允许您在JavaScript中选择文档中的元素,并将它们存储为Element对象以供后续...
if (_className.test(elem.className)) { arr.push(elem); } } return arr; } Explanation: In the above code, we’ve instructed JavaScript to search through the entire document all elements by taking the values of the two parameters (which are optional) startElem and filterTag as default. Th...
if (_className.test(elem.className)) { arr.push(elem); } } return arr; } Explanation: In the above code, we’ve instructed JavaScript to search through the entire document all elements by taking the values of the two parameters (which are optional) startElem and filterTag as default. Th...