HTML5 web storage detailed explanation
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!
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
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1655
14
1414
52
1307
25
1253
29
1227
24
What exactly does H5 page production mean?
Apr 06, 2025 am 07:18 AM
H5 page production refers to the creation of cross-platform compatible web pages using technologies such as HTML5, CSS3 and JavaScript. Its core lies in the browser's parsing code, rendering structure, style and interactive functions. Common technologies include animation effects, responsive design, and data interaction. To avoid errors, developers should be debugged; performance optimization and best practices include image format optimization, request reduction and code specifications, etc. to improve loading speed and code quality.
How to run the h5 project
Apr 06, 2025 pm 12:21 PM
Running the H5 project requires the following steps: installing necessary tools such as web server, Node.js, development tools, etc. Build a development environment, create project folders, initialize projects, and write code. Start the development server and run the command using the command line. Preview the project in your browser and enter the development server URL. Publish projects, optimize code, deploy projects, and set up web server configuration.
How to make h5 click icon
Apr 06, 2025 pm 12:15 PM
The steps to create an H5 click icon include: preparing a square source image in the image editing software. Add interactivity in the H5 editor and set the click event. Create a hotspot that covers the entire icon. Set the action of click events, such as jumping to the page or triggering animation. Export H5 documents as HTML, CSS, and JavaScript files. Deploy the exported files to a website or other platform.
How to make pop-up windows with h5
Apr 06, 2025 pm 12:12 PM
H5 pop-up window creation steps: 1. Determine the triggering method (click, time, exit, scroll); 2. Design content (title, text, action button); 3. Set style (size, color, font, background); 4. Implement code (HTML, CSS, JavaScript); 5. Test and deployment.
What application scenarios are suitable for H5 page production
Apr 05, 2025 pm 11:36 PM
H5 (HTML5) is suitable for lightweight applications, such as marketing campaign pages, product display pages and corporate promotion micro-websites. Its advantages lie in cross-platformity and rich interactivity, but its limitations lie in complex interactions and animations, local resource access and offline capabilities.
What Does H5 Refer To? Exploring the Context
Apr 12, 2025 am 12:03 AM
H5referstoHTML5,apivotaltechnologyinwebdevelopment.1)HTML5introducesnewelementsandAPIsforrich,dynamicwebapplications.2)Itsupportsmultimediawithoutplugins,enhancinguserexperienceacrossdevices.3)SemanticelementsimprovecontentstructureandSEO.4)H5'srespo
Is h5 same as HTML5?
Apr 08, 2025 am 12:16 AM
"h5" and "HTML5" are the same in most cases, but they may have different meanings in certain specific scenarios. 1. "HTML5" is a W3C-defined standard that contains new tags and APIs. 2. "h5" is usually the abbreviation of HTML5, but in mobile development, it may refer to a framework based on HTML5. Understanding these differences helps to use these terms accurately in your project.
H5 Code: Accessibility and Semantic HTML
Apr 09, 2025 am 12:05 AM
H5 improves web page accessibility and SEO effects through semantic elements and ARIA attributes. 1. Use, etc. to organize the content structure and improve SEO. 2. ARIA attributes such as aria-label enhance accessibility, and assistive technology users can use web pages smoothly.
