document.getElementsByClassName()
时间: 2023-11-30 13:04:01 浏览: 30
The `getElementsByClassName()` method is a built-in JavaScript method that returns a collection of all elements in the document that have a specific class name. It takes one parameter, which is the name of the class to search for, and returns an HTMLCollection object.
Syntax:
```javascript
document.getElementsByClassName(classname);
```
Example:
```html
<body>
<div class="box">Box 1</div>
<div class="box">Box 2</div>
<div class="box">Box 3</div>
<div class="box">Box 4</div>
<div class="box">Box 5</div>
</body>
```
```javascript
const boxes = document.getElementsByClassName("box");
console.log(boxes);
// Output: HTMLCollection [div.box, div.box, div.box, div.box, div.box]
```
Note that `getElementsByClassName()` returns a live collection, meaning that any changes made to the DOM will be reflected in the collection.
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