The past was dominated by the getElementById, getElementsByTagName, and getElementsByClassName functions that pretty much did exactly as their names describe. You may still see these functions used in older books, tutorials, and snippets online. In general, you should just use querySelector and ...
1.DOM提供了一个名为getElementById的方法,这个方法将返回一个与之对应id属性的节点对象,它是document对象特有的函数,只能通过其来调用该方法,使用方法如下:document.getElementById('idName'); 2.getElementsByTagName方法返回一个对象数组(准确的说是HTMLCollection集合),返回元素的顺序是它们在文档中的顺序,传递给 ...
document.getElementsByTagName(name) 通过标签名来查找元素。 document.getElementsByClassName(name) 通过类名来查找元素。...document.querySelector(CSS选择器) 通过CSS选择器选择一个元素。 document.querySelectorAll(CSS选择器) 通过CSS选择器选择多个元素。... 3. document.getElementsByClassName(name) ge...
Explanation of the above code:In the example, we are selecting by using id the id here is Selector. For the querySelector() method we are passing the id it will check for the particular id name in the program. Now it has found the tag which is having the same id name as mentioned...
Methods allow you to quickly and easily retrieve element nodes from the DOM by matching against selectors. You can select elements by class, id or name, or any complex CSS selector. For more information on how to effectively apply selectors to select the elements you want to style, please ...
- Select by ID: const element =document.querySelector('#idname'); - Select by tag name: const element = document.querySelector('tagname'); - Select by attribute: const element = document.querySelector('[attribute=value]'); - Select by attribute prefix: const element = document.querySele...
document.querySelector('#login_name')?.removeAttribute('required'); hideElem('.non-local'); showElem('.local'); document.getElementById('user_name')?.focus(); document.querySelector('#user_name')?.focus(); if (this.getAttribute('data-password') === 'required') { document.getElement...
</p> <form id="myForm"> <label for="username">Username:</label> <input type="text" id="username" name="username"> <br><br> <label for="password">Password:</label> <input type="password" id="password" name="password"> <br><br> <button type="button"onclick="submitForm()">...
If you want to query for elements with a specified class name, use the getElementsByClassName method. Syntax:object.querySelector (selectors); You can find the related objects in the Supported by objects section below. Parameters: selectors String that specifies the chain of selectors. The synta...
EN首先在VSCode中打开一个HTML文件 然后点右下角的“选择语言模式” image.png 然后点击配置HTML语言的基础设置 image.png 然后在打开的界面中（右侧） 输入如下代码 { "editor.quickSuggestions": { "other": true, "comments": true, "strings": true }, "[html]": { } } 然后重启VSCode 再试试看 ...