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

1. 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');

2. 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

3. 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');

4. 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：25

4. 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:

1. The data storage size of SessionStorage is limited, and the limit size of each browser may be different, generally around 5MB. .
2. SessionStorage between different browser windows (or tabs) is independent, and data cannot be shared.
3. 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.
4. 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.

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