Learn data storage skills: master how to use sessionstorage
How to use SessionStorage: Quickly master data storage skills
SessionStorage is a Web API for temporarily storing data in the browser. It provides a simple and convenient way for us to store data in the browser during the user session. This article will introduce how to use SessionStorage and provide specific code examples to help readers quickly master data storage techniques.
1. Basic concepts and uses of SessionStorage
SessionStorage is a new Client-side storage technology in the HTML5 standard, which can store data in the client's browser. Similar to LocalStorage, SessionStorage also stores data in the form of "key-value pairs". The difference is that the data stored in SessionStorage is only valid during the current session. Once the session ends or the browser is closed, the data will be cleared.
The main purpose of SessionStorage is to share data between different pages. For example, in a shopping website, we can use SessionStorage to save the product information selected by the user, and then read this information on the checkout page. In addition, SessionStorage can also be used to store the user's login status, communication between pages, etc.
2. Steps to use SessionStorage
- Storing data
To store data in SessionStorage, we can use the setItem() method. The setItem() method accepts two parameters. The first parameter is the key name of the data to be stored, and the second parameter is the value of the data to be stored.
SessionStorage.setItem('username', '张三');- Get data
To get the data stored in SessionStorage, we can use the getItem() method. The getItem() method accepts one parameter, which is the key name of the data to be obtained.
let username = SessionStorage.getItem('username');
console.log(username); // 输出：张三- Delete data
To delete data in SessionStorage, we can use the removeItem() method. The removeItem() method accepts one parameter, which is the key name of the data to be deleted.
SessionStorage.removeItem('username');- Clear all data
To clear all data in SessionStorage, we can use the clear() method.
SessionStorage.clear();
3. Storage of objects and arrays
SessionStorage can only store string type data, but cannot directly store objects or arrays. But we can use the JSON.stringify() method to convert the object or array into a string for storage, and then use the JSON.parse() method to convert the string back to the object or array.
For example, store an object:
let user = {
name: '李四',
age: 25
};
SessionStorage.setItem('user', JSON.stringify(user));Then get the object:
let userStr = SessionStorage.getItem('user');
let user = JSON.parse(userStr);
console.log(user.name); // 输出：李四
console.log(user.age); // 输出：254. Limitations and precautions of SessionStorage
Although SessionStorage provides A convenient way to store and access data, but there are also some limitations and things to pay attention to:
- The data storage size of SessionStorage is limited, and the limit size of each browser may be different, generally around 5MB. .
- SessionStorage between different browser windows (or tabs) is independent, and data cannot be shared.
- The data is stored in the client browser and may be challenged by some security issues, so it is not safe to store sensitive information.
- Data in SessionStorage can be shared between different pages under the same domain name, but pages between different domain names cannot be shared.
Summary:
SessionStorage is a simple and easy-to-use data storage technique that can easily temporarily store data in the browser. This article introduces the basic concepts and uses of SessionStorage, and provides specific code examples to help readers master how to use SessionStorage. It also introduces methods of storing objects and arrays, as well as the limitations and considerations of SessionStorage. I hope readers can better use SessionStorage for data storage through the guidance of this article.
The above is the detailed content of Learn data storage skills: master how to use sessionstorage. For more information, please follow other related articles on 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
AI Hentai Generator
Generate AI Hentai for free.
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
1384
52
Win11 Tips Sharing: Skip Microsoft Account Login with One Trick
Mar 27, 2024 pm 02:57 PM
Win11 Tips Sharing: One trick to skip Microsoft account login Windows 11 is the latest operating system launched by Microsoft, with a new design style and many practical functions. However, for some users, having to log in to their Microsoft account every time they boot up the system can be a bit annoying. If you are one of them, you might as well try the following tips, which will allow you to skip logging in with a Microsoft account and enter the desktop interface directly. First, we need to create a local account in the system to log in instead of a Microsoft account. The advantage of doing this is
What are the tips for novices to create forms?
Mar 21, 2024 am 09:11 AM
We often create and edit tables in excel, but as a novice who has just come into contact with the software, how to use excel to create tables is not as easy as it is for us. Below, we will conduct some drills on some steps of table creation that novices, that is, beginners, need to master. We hope it will be helpful to those in need. A sample form for beginners is shown below: Let’s see how to complete it! 1. There are two methods to create a new excel document. You can right-click the mouse on a blank location on the [Desktop] - [New] - [xls] file. You can also [Start]-[All Programs]-[Microsoft Office]-[Microsoft Excel 20**] 2. Double-click our new ex
A must-have for veterans: Tips and precautions for * and & in C language
Apr 04, 2024 am 08:21 AM
In C language, it represents a pointer, which stores the address of other variables; & represents the address operator, which returns the memory address of a variable. Tips for using pointers include defining pointers, dereferencing pointers, and ensuring that pointers point to valid addresses; tips for using address operators & include obtaining variable addresses, and returning the address of the first element of the array when obtaining the address of an array element. A practical example demonstrating the use of pointer and address operators to reverse a string.
VSCode Getting Started Guide: A must-read for beginners to quickly master usage skills!
Mar 26, 2024 am 08:21 AM
VSCode (Visual Studio Code) is an open source code editor developed by Microsoft. It has powerful functions and rich plug-in support, making it one of the preferred tools for developers. This article will provide an introductory guide for beginners to help them quickly master the skills of using VSCode. In this article, we will introduce how to install VSCode, basic editing operations, shortcut keys, plug-in installation, etc., and provide readers with specific code examples. 1. Install VSCode first, we need
Win11 Tricks Revealed: How to Bypass Microsoft Account Login
Mar 27, 2024 pm 07:57 PM
Win11 tricks revealed: How to bypass Microsoft account login Recently, Microsoft launched a new operating system Windows11, which has attracted widespread attention. Compared with previous versions, Windows 11 has made many new adjustments in terms of interface design and functional improvements, but it has also caused some controversy. The most eye-catching point is that it forces users to log in to the system with a Microsoft account. For some users, they may be more accustomed to logging in with a local account and are unwilling to bind their personal information to a Microsoft account.
PHP programming skills: How to jump to the web page within 3 seconds
Mar 24, 2024 am 09:18 AM
Title: PHP Programming Tips: How to Jump to a Web Page within 3 Seconds In web development, we often encounter situations where we need to automatically jump to another page within a certain period of time. This article will introduce how to use PHP to implement programming techniques to jump to a page within 3 seconds, and provide specific code examples. First of all, the basic principle of page jump is realized through the Location field in the HTTP response header. By setting this field, the browser can automatically jump to the specified page. Below is a simple example demonstrating how to use P
What are the advantages of html5
Apr 22, 2024 am 11:09 AM
The main advantages of HTML5 include: Semantic markup: clearly conveys content structure and meaning. Multimedia support: native playback of video and audio. Canvas: Create motion graphics and animations. Local Storage: Client stores data and accesses it across sessions. Geolocation: Obtain the user's geographical location information. WebSockets: Continuous connection between browser and server. Mobile Friendly: Works on a variety of devices. Security: CSP and CORS protect against cyber threats. Ease of use: Easy to learn and use. Support: Extensive support for all major browsers and devices.
In-depth understanding of function refactoring techniques in Go language
Mar 28, 2024 pm 03:05 PM
In Go language program development, function reconstruction skills are a very important part. By optimizing and refactoring functions, you can not only improve code quality and maintainability, but also improve program performance and readability. This article will delve into the function reconstruction techniques in the Go language, combined with specific code examples, to help readers better understand and apply these techniques. 1. Code example 1: Extract duplicate code fragments. In actual development, we often encounter reused code fragments. At this time, we can consider extracting the repeated code as an independent function to
