constoutput=document.getElementById('output'); output.textContent+=message+'\n'; } functionclearLog() { document.getElementById('output').textContent=''; } // 获取元素集合 constbyClassName=document.getElementsByClassName('sample-element'); constbyQueryAll=document.querySelectorAll('.sample-element...
替换getElementByClassName为getElementsByClassName请注意,它的复数 ( Elements) 以“ s”结尾,而不是单数 ( Element)同一个类可以添加到多个对象,因此,按类名选择会返回多个项目,而不仅仅是一个,因此它使用复数形式Elements而不是元素,getElementById()因为 id 必须是唯一的,而按 id 选择将只返回一个 DOM 元素...
document.getElementsByClassName不起作用 function getHeight(element) { var offsetHeight =document.getElementsByClassName(element).offsetHeight;}虽然它正确地使用document.getElementsByClassName(element)将元素打印到控制台,但我无法访问offsetHeight属性,即使使用< 浏览10提问于2015-01-09得票数0 回答已采纳 2回答 Jav...
1、通过id获取:window(可省).document.getElementById("标签的id值"); 2、通过name获取:document.getElementsByName("标签的name值"); 3、通过标签名获取:document.getElementsByTagName("标签名"); 4、通过class获取:document.getElementsByClassName("标签的class值") 间接获取: 1、父获子:通过父标签对象获取子...
SELECT tablespace_name, SUM(bytes) free FROM dba_free_space GROUP BY tablespace_name ； 如果...
1if(!document.getElementsByClassName) {2document.getElementsByClassName =function(className, element) {3varchildren = (element || document).getElementsByTagName('*');4varelements =newArray();5for(vari = 0; i < children.length; i++) {6varchild =children[i];7varclassNames = child.className...
getElementByClassName:通过类名来获取(注意:getElementsByClassName有很强的兼容性问题,一般不用) 按钮 var Haha=document.getElementsByClassName("haha");//获取class为haha的页面元素 console.log(Haha); //打印出来之后发现也是以数组的形式呈现 var Btn=document...
document.getElementById("main").getElementsByClassName("test"); Get the first element with a class of 'test', or undefined if there is no matching element:jsCopy to Clipboard document.getElementsByClassName("test")[0]; We can also use methods of Array.prototype on any HTMLCollection by passin...
var g=function (id){ if (id.substr(0,1)=='.') { return document.getElementByClassName(id.substr(1)); } return document.getElementById(id); }qq_未完待续_13 浏览5085回答3 3回答 qq_未完待续_13 getElementsByClassName少个s 2 0 0 qq_未完待续_13 当调用函数:g('.main-i');时报...
The getElementById() Method The getElementsByTagName() Method The querySelector() Method The querySelectorAll() Method The HTMLCollection Object Syntax document.getElementsByClassName(classname) Parameters ParameterDescription classnameRequired. The class name of the elements. ...