1. Overview localStorage and sessionStorage are collectively called Web Storage, which allows web pages to store data on the browser side. The data saved by sessionStorage is used for a browser session. When the session ends (usually the window is closed), the data is cleared; the data saved by localStorage exists for a long time. The next time you visit the website, the web page can directly read the previously saved data. data. Except for the different storage periods, the properties and methods of the two objects are exactly the same. They are much like an enhanced version of the cookie mechanism and can use much larger storage space. Currently, the storage limit per domain depends on the browser, and is 2.5MB for Chrome, 5MB for Firefox and Opera, and 10MB for IE. Among them, Firefox's storage space is determined by the first-level domain name, while other browsers do not have this limitation. That is, in Firefox, a.example.com and b.example share 5MB of storage space. In addition, like cookies, they are also subject to same domain restrictions. The data stored in a web page is only
1. Specific analysis of localStorage and sessionStorage of HTML5 local storage
Introduction: The data saved by sessionStorage is used for a session of the browser. When the session ends (usually the window is closed), the data is cleared; the data saved by localStorage exists for a long time. When visiting the website once, the web page can directly read the previously saved data. Except for the different storage periods, the properties and methods of the two objects are exactly the same.
Introduction: Talk about Local storage pros and cons Cookie, localStorage, sessionStorage
Introduction: This article mainly introduces the basic usage of HTML5 local storage localStorage, sessionStorage, traversal operations, exception handling, etc. Friends in need can refer to it
[Related Q&A Recommendations]:
Why do localStorage and sessionStorage belong to the category of html5, but why do IE8 support them?
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There is no difference between HTML5 and H5, which is the abbreviation of HTML5. 1.HTML5 is the fifth version of HTML, which enhances the multimedia and interactive functions of web pages. 2.H5 is often used to refer to HTML5-based mobile web pages or applications, and is suitable for various mobile devices.

HTML5 is the latest version of the Hypertext Markup Language, standardized by W3C. HTML5 introduces new semantic tags, multimedia support and form enhancements, improving web structure, user experience and SEO effects. HTML5 introduces new semantic tags, such as, ,, etc., to make the web page structure clearer and the SEO effect better. HTML5 supports multimedia elements and no third-party plug-ins are required, improving user experience and loading speed. HTML5 enhances form functions and introduces new input types such as, etc., which improves user experience and form verification efficiency.

How to write clean and efficient HTML5 code? The answer is to avoid common mistakes by semanticizing tags, structured code, performance optimization and avoiding common mistakes. 1. Use semantic tags such as, etc. to improve code readability and SEO effect. 2. Keep the code structured and readable, using appropriate indentation and comments. 3. Optimize performance by reducing unnecessary tags, using CDN and compressing code. 4. Avoid common mistakes, such as the tag not closed, and ensure the validity of the code.

H5 improves web user experience with multimedia support, offline storage and performance optimization. 1) Multimedia support: H5 and elements simplify development and improve user experience. 2) Offline storage: WebStorage and IndexedDB allow offline use to improve the experience. 3) Performance optimization: WebWorkers and elements optimize performance to reduce bandwidth consumption.

HTML5 code consists of tags, elements and attributes: 1. The tag defines the content type and is surrounded by angle brackets, such as. 2. Elements are composed of start tags, contents and end tags, such as contents. 3. Attributes define key-value pairs in the start tag, enhance functions, such as. These are the basic units for building web structure.

HTML5 is a key technology for building modern web pages, providing many new elements and features. 1. HTML5 introduces semantic elements such as, , etc., which enhances web page structure and SEO. 2. Support multimedia elements and embed media without plug-ins. 3. Forms enhance new input types and verification properties, simplifying the verification process. 4. Offer offline and local storage functions to improve web page performance and user experience.

Best practices for H5 code include: 1. Use correct DOCTYPE declarations and character encoding; 2. Use semantic tags; 3. Reduce HTTP requests; 4. Use asynchronous loading; 5. Optimize images. These practices can improve the efficiency, maintainability and user experience of web pages.

Web standards and technologies have evolved from HTML4, CSS2 and simple JavaScript to date and have undergone significant developments. 1) HTML5 introduces APIs such as Canvas and WebStorage, which enhances the complexity and interactivity of web applications. 2) CSS3 adds animation and transition functions to make the page more effective. 3) JavaScript improves development efficiency and code readability through modern syntax of Node.js and ES6, such as arrow functions and classes. These changes have promoted the development of performance optimization and best practices of web applications.


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