Storing data on the client
HTML5 provides two new methods of storing data on the client:
• localStorage - data storage without time limits
• sessionStorage - Data storage for a session
Before, these were all done by cookies. But cookies are not suitable for storing large amounts of data because they are passed with each request to the server, which makes cookies slow and inefficient.
In HTML5, data is not passed by every server request, but data is only used when requested. It makes it possible to store large amounts of data without affecting website performance.
For different websites, data is stored in different areas, and a website can only access its own data.
HTML5 uses JavaScript to store and access data.
localStorage method
The data stored by the localStorage method has no time limit. The data is still available after the next day, week or year.
How to create and access localStorage:
<!DOCTYPE HTML>
<html>
<body>
<script type="text/javascript">
localStorage.lastname="Smith";
document.write("Last name: " + localStorage.lastname);
</script>
</body>
</html>The following example counts the number of times a user visits a page:
<!DOCTYPE HTML>
<html>
<body>
<script type="text/javascript">
if (localStorage.pagecount)
{
localStorage.pagecount=Number(localStorage.pagecount) +1;
}
else
{
localStorage.pagecount=1;
}
document.write("Visits: " + localStorage.pagecount + " time(s).");
</script>
<p>刷新页面会看到计数器在增长。</p>
<p>请关闭浏览器窗口，然后再试一次，计数器会继续计数。</p>
</body>
</html>sessionStorage method
sessionStorage method targets a session for data storage. The data is deleted when the user closes the browser window.
How to create and access a sessionStorage:
<!DOCTYPE HTML> <html> <body> <script type="text/javascript"> sessionStorage.lastname="Smith"; document.write(sessionStorage.lastname); </script> </body> </html>
The following example counts the number of times a user visits a page in the current session:
<!DOCTYPE HTML>
<html>
<body>
<script type="text/javascript">
if (sessionStorage.pagecount)
{
sessionStorage.pagecount=Number(sessionStorage.pagecount) +1;
}
else
{
sessionStorage.pagecount=1;
}
document.write("Visits " + sessionStorage.pagecount + " time(s) this session.");
</script>
<p>刷新页面会看到计数器在增长。</p>
<p>请关闭浏览器窗口，然后再试一次，计数器已经重置了。</p>
</body>
</html>The above is a detailed explanation of HTML5 Web storage This is all the content that the editor has shared with you. I hope it can give you a reference and I hope you will support the PHP Chinese website.
For more articles related to HTML5 Web storage details, please pay attention to the PHP Chinese website!
Mastering Microdata: A Step-by-Step Guide for HTML5May 14, 2025 am 12:07 AMMicrodatainHTML5enhancesSEOanduserexperiencebyprovidingstructureddatatosearchengines.1)Useitemscope,itemtype,anditempropattributestomarkupcontentlikeproductsorevents.2)TestmicrodatawithtoolslikeGoogle'sStructuredDataTestingTool.3)ConsiderusingJSON-LD
What's New in HTML5 Forms? Exploring the New Input TypesMay 13, 2025 pm 03:45 PMHTML5introducesnewinputtypesthatenhanceuserexperience,simplifydevelopment,andimproveaccessibility.1)automaticallyvalidatesemailformat.2)optimizesformobilewithanumerickeypad.3)andsimplifydateandtimeinputs,reducingtheneedforcustomsolutions.
Understanding H5: The Meaning and SignificanceMay 11, 2025 am 12:19 AMH5 is HTML5, the fifth version of HTML. HTML5 improves the expressiveness and interactivity of web pages, introduces new features such as semantic tags, multimedia support, offline storage and Canvas drawing, and promotes the development of Web technology.
H5: Accessibility and Web Standards ComplianceMay 10, 2025 am 12:21 AMAccessibility and compliance with network standards are essential to the website. 1) Accessibility ensures that all users have equal access to the website, 2) Network standards follow to improve accessibility and consistency of the website, 3) Accessibility requires the use of semantic HTML, keyboard navigation, color contrast and alternative text, 4) Following these principles is not only a moral and legal requirement, but also amplifying user base.
What is the H5 tag in HTML?May 09, 2025 am 12:11 AMThe H5 tag in HTML is a fifth-level title that is used to tag smaller titles or sub-titles. 1) The H5 tag helps refine content hierarchy and improve readability and SEO. 2) Combined with CSS, you can customize the style to enhance the visual effect. 3) Use H5 tags reasonably to avoid abuse and ensure the logical content structure.
H5 Code: A Beginner's Guide to Web StructureMay 08, 2025 am 12:15 AMThe methods of building a website in HTML5 include: 1. Use semantic tags to define the web page structure, such as, , etc.; 2. Embed multimedia content, use and tags; 3. Apply advanced functions such as form verification and local storage. Through these steps, you can create a modern web page with clear structure and rich features.
H5 Code Structure: Organizing Content for ReadabilityMay 07, 2025 am 12:06 AMA reasonable H5 code structure allows the page to stand out among a lot of content. 1) Use semantic labels such as, etc. to organize content to make the structure clear. 2) Control the rendering effect of pages on different devices through CSS layout such as Flexbox or Grid. 3) Implement responsive design to ensure that the page adapts to different screen sizes.
H5 vs. Older HTML Versions: A ComparisonMay 06, 2025 am 12:09 AMThe main differences between HTML5 (H5) and older versions of HTML include: 1) H5 introduces semantic tags, 2) supports multimedia content, and 3) provides offline storage functions. H5 enhances the functionality and expressiveness of web pages through new tags and APIs, such as and tags, improving user experience and SEO effects, but need to pay attention to compatibility issues.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.
ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment
Zend Studio 13.0.1
Powerful PHP integrated development environment
SublimeText3 Chinese version
Chinese version, very easy to use
DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software
