getElementById
时间: 2023-10-24 19:21:05 浏览: 26
getElementById is a method in JavaScript that returns the element with the specified ID (or unique identifier) in an HTML document. It is commonly used to manipulate or retrieve the content of a specific element on a webpage. The method takes a single parameter, which is the ID of the element to be retrieved, and returns the element as an object. If no element with the specified ID exists, the method returns null.
Here's an example code snippet that demonstrates how to use getElementById:
```javascript
// Retrieve the element with ID "myElement" and change its text content
var elem = document.getElementById("myElement");
elem.textContent = "Hello, world!";
```
In this example, the method is used to retrieve an element with ID "myElement" and change its text content to "Hello, world!".
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