How is localstorage saved?

Localstorage saves data in the form of key-value pairs. Each key-value pair consists of a unique key and a corresponding value. The value can be a string, number, Boolean value, object or array. Localstorage can only store string type values. If you need to store other types of values, you can use the JSON.stringify() method to convert them to strings and then store them. localstorage is a Web API provided by the browser for saving data on the client side.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

Localstorage is a Web API provided by the browser for saving data on the client side. It provides an easy way to store and retrieve data without using a server or database. In this article, we will explore how localstorage saves data.

Localstorage uses key-value pairs to save data. Each key-value pair consists of a unique key and corresponding value. Values ​​can be strings, numbers, booleans, objects, or arrays. Localstorage can only store string type values. If you need to store other types of values, you can use the JSON.stringify() method to convert them to strings and then store them.

When we use localstorage to save data, the data will be permanently saved in the browser. Even if the user closes the browser or restarts the computer, the data will still be retained. This is because localstorage uses persistent storage technology to save data on the user's hard drive.

The storage space of localstorage is limited, and the storage space size of different browsers is also different. Typically, the storage space of localstorage is 5MB to 10MB. If the storage space limit is exceeded, no more data can be saved. Therefore, when using localstorage, we should make reasonable use of storage space and avoid storing too much data.

Localstorage provides some methods to manipulate data, including setItem(), getItem(), removeItem() and clear(), etc. The setItem() method is used to save data. It accepts two parameters, the first parameter is the key, and the second parameter is the value. The getItem() method is used to obtain saved data. It accepts one parameter, which is the key. The removeItem() method is used to delete the data of the specified key. It accepts one parameter, which is the key. The clear() method is used to clear all saved data. It does not accept any parameters.

The following is an example of using localstorage to save data:

// 保存数据
localStorage.setItem('name', 'John');
localStorage.setItem('age', '25');
// 获取数据
var name = localStorage.getItem('name');
var age = localStorage.getItem('age');
console.log(name); // 输出：John
console.log(age); // 输出：25
// 删除数据
localStorage.removeItem('age');
// 清空数据
localStorage.clear();

To summarize, localstorage saves data in the form of key-value pairs, and the data is permanently saved in the browser using persistent storage technology. It provides several methods to manipulate data, including saving, retrieving, deleting and clearing data. When using localstorage, we need to pay attention to the limitations of storage space, make reasonable use of storage space, and avoid storing too much data.

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