# DOM节点操作

## DOM节点操作

* 获取DOM节点
* prototype,获取JS对象上的属性
* Attribute,获取DOM标签上的属性

## 获取DOM节点

```javascript
var div1 = document.getElementById('div1'); //元素
var divList = document.getElementByTagName('div'); //集合
console.log(divList.length);
console.log(divList[0]);
var containerList = document.getElementByClassName('.container'); //集合
var pList = document.querySelectorAll('p'); //集合
```

### property

```javascript
var pList = document.querySelectorAll('p');
var p = pList[0];
console.log(p.style.width); // 获取样式
p.style.width = '100px' // 修改样式
console.log(p.className);//获取class
p.className = 'p1' //修改class

// 获取 nodeName 和 ndoeType
console.log(p.nodeName);
console.log(p.nodeType);
```

### Attribute

```javascript
var pList = document.querySelectorAll('p');
var p = pList[0];
p.getAttribute('data-name');
p.getAttribute('data-name','imooc');
p.getAttribute('style');
p.setAttribute('style','font-size:30px;');
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://jonathan-zhang.gitbook.io/javascript-steppitguide/ji-chu-zhi-shi/06/domjie-dian-cao-zuo.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.