All nodes are represented using the Node interface. You can use many methods to obtain nodes, such as document.getElementsByTagName(), document.getElementsByName(), etc., which all return a NodeList object, and then obtain the node.
The corresponding attributes and amplification of nodes are defined in the Node interface:
1. Common attribute list of Node interface
属性名 | 数据类型 | 说明 |
nodeName | DOMString | 返回节点名 |
nodeValue | DOMString | 返回节点值 |
nodeType | int | 返回节点类型(见后文) |
parentNode | Node | 返回当前节点的父节点 |
childNodes | NodeList | 返回当前节点的所有子节点 |
firstChild | Node | 返回当前节点的第一个子节点 |
lastChild | Node | 返回当前节点的最后一个子节点 |
previousSibling | Node | 返回当前节点的紧邻的前一个兄弟节点 |
nextSibling | Node | 返回当前节点的紧邻的后一个兄弟节点 |
attributes | NamedNodeMap | 返回当前节点的所有属性 |
ownerDocument | Document | 返回当前节点对应的Document对象 |
namespaceURI | DOMString | 返回当前节点所属命名空间的URI |
prefix | DOMString | 返回当前节点所属命名空间的前缀 |
localName | DOMString | 返回当前节点限定名的本地部分 |
2. List of common methods of Node interface
方法名 | 数据类型 | 说明 |
appendChild | Node | 在末尾添加一个子节点 |
cloneNode | Node | 克隆一个子节点 |
hasAttributes | Boolean | 判断该节点是否有属性 |
hasChildNodes | Boolean | 判断该节点是否有子节点 |
insertBefore | Node | 在指定节点插入一个节点 |
isSupported | Boolean | 判断节点特定是否被支持 |
normalize | Void | 规格化节点 |
removeChild | Node | 删除一个子节点 |
replaceChild | Node | 替换一个子节点 |
3. Node type
In In a DOM document, each node belongs to a type. You can use the Node.nodeType property to obtain the node type. The DOM specification specifies 12 node types, which can be represented by constants defined by the Node interface or by numbers.
节点类型常量 | 数值表示 | 说明 |
ELEMENT_NODE | 1 | 元素节点 |
ATTRIBUTE_NODE | 2 | 属性节点 |
TEXT_NODE | 3 | 文本节点 |
CDATA_SECTION_NODE | 4 | CDATA节点 |
ENTITY_REFERENCE_NODE | 5 | 实体引用节点 |
ENTITY_NODE | 6 | 实体节点 |
PROCESSING_INSTRUCTION_NODE | 7 | 处理指令节点 |
COMMENT_NODE | 8 | 注释节点 |
DOCUMENT_NODE | 9 | 文档节点 |
DOCUMENT_TYPE_NODE | 10 | 文档类型节点 |
DOCUMENT_FRAGMENT_NODE | 11 | 文档片段节点 |
NOTATION_NODE | 12 | 符号节点 |
PS: IE does not support constant representation, it is best to use numbers. The six most commonly used Node types: 1,2,3,8,9,11

The future trends of HTML are semantics and web components, the future trends of CSS are CSS-in-JS and CSSHoudini, and the future trends of JavaScript are WebAssembly and Serverless. 1. HTML semantics improve accessibility and SEO effects, and Web components improve development efficiency, but attention should be paid to browser compatibility. 2. CSS-in-JS enhances style management flexibility but may increase file size. CSSHoudini allows direct operation of CSS rendering. 3.WebAssembly optimizes browser application performance but has a steep learning curve, and Serverless simplifies development but requires optimization of cold start problems.

The roles of HTML, CSS and JavaScript in web development are: 1. HTML defines the web page structure, 2. CSS controls the web page style, and 3. JavaScript adds dynamic behavior. Together, they build the framework, aesthetics and interactivity of modern websites.

The future of HTML is full of infinite possibilities. 1) New features and standards will include more semantic tags and the popularity of WebComponents. 2) The web design trend will continue to develop towards responsive and accessible design. 3) Performance optimization will improve the user experience through responsive image loading and lazy loading technologies.

The roles of HTML, CSS and JavaScript in web development are: HTML is responsible for content structure, CSS is responsible for style, and JavaScript is responsible for dynamic behavior. 1. HTML defines the web page structure and content through tags to ensure semantics. 2. CSS controls the web page style through selectors and attributes to make it beautiful and easy to read. 3. JavaScript controls web page behavior through scripts to achieve dynamic and interactive functions.

HTMLisnotaprogramminglanguage;itisamarkuplanguage.1)HTMLstructuresandformatswebcontentusingtags.2)ItworkswithCSSforstylingandJavaScriptforinteractivity,enhancingwebdevelopment.

HTML is the cornerstone of building web page structure. 1. HTML defines the content structure and semantics, and uses, etc. tags. 2. Provide semantic markers, such as, etc., to improve SEO effect. 3. To realize user interaction through tags, pay attention to form verification. 4. Use advanced elements such as, combined with JavaScript to achieve dynamic effects. 5. Common errors include unclosed labels and unquoted attribute values, and verification tools are required. 6. Optimization strategies include reducing HTTP requests, compressing HTML, using semantic tags, etc.

HTML is a language used to build web pages, defining web page structure and content through tags and attributes. 1) HTML organizes document structure through tags, such as,. 2) The browser parses HTML to build the DOM and renders the web page. 3) New features of HTML5, such as, enhance multimedia functions. 4) Common errors include unclosed labels and unquoted attribute values. 5) Optimization suggestions include using semantic tags and reducing file size.

WebdevelopmentreliesonHTML,CSS,andJavaScript:1)HTMLstructurescontent,2)CSSstylesit,and3)JavaScriptaddsinteractivity,formingthebasisofmodernwebexperiences.


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