Another way you can use Javascript to get an element by a class is to use thequerySelectorAllJavascript method. The difference between thegetElementsByClassNameandquerySelectorAllJavascript methods isn’t that
varx=document.getElementById("main");vary=x.getElementsByTagName("p"); 三、通过类名称找到HTML元素 如果想找到同一类名称的所有HTML元素,使用getElementsByClassName()。 例: 返回所有class="intro"的元素列表. 代码语言:javascript 代码运行次数:0
getElementsByTagName() 通过标 tag 标签查找 HTML 元素 querySelector() CSS 选择器查找 HTML 元素 querySelectorAll() CSS 选择器查找符合条件所有 HTML 元素 document.forms() 对象选择器查找 HTML 对象 以上方法中只有getElementById()和querySelector()查找到的是单个元素,其它都是查找到的元素集合(相当于一...
var div=document.getElementById('demo'); 1. 2. 3. 4. 5. 目标很明确,选择了id='demo'的div 注意:元素在ie8以下的选择器,不区分id的大小写,而且也能匹配name属性的元素(也就是如果有name='demo')那么也会被匹配。 2:document.getElementsByTagName() 通过标签名来选择标签。 123 456 v...
if (allPageTags[i].className==theClass) { //Manipulate this in whatever way you want allPageTags[i].style.display='none'; } } } 鉴于getElementById()方法使用比较频繁,我在网上搜集了一下关于此方法的一些用法。 document.getElementById("link").href; ...
let elements = document.getElementsByClassName('foo bar'); 上面代码返回同时具有foo和bar两个class的元素,foo和bar的顺序不重要。 注意,正常模式下,CSS 的class是大小写敏感的。(quirks mode下,大小写不敏感。) 与getElementsByTagName()方法一样,getElementsByClassName()方法不仅可以在document对象上调用,也可以...
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and this very helpful method has been joined by getElementsByTagName, to get all elements via a specific element tag; getElementsByClassName, to get all elements that share the same class name; and the very new querySelector and querySelectorAll methods, which allow us to use the CSS style...
One effective alternative when multiple DOM elements need to be added is to usedocument fragmentsinstead, which willimprove efficiency and performance. For example: constdiv =document.getElementById("my_div");constfragment =document.createDocumentFragment();constelems =document.querySelectorAll('a')...
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