How to store uniapp locally

Uniapp is a cross-platform development framework that is widely used to develop applications based on WeChat applets, H5, Android, iOS and other platforms. As applications become more and more complex, data storage becomes an issue that must be considered. Local storage is a common data storage method that allows us to easily save and read the data required by the application. This article will introduce how uniapp uses local storage to help developers better manage data.

1. Local storage in uniapp

uniapp provides a simple and easy-to-use local storage method. It can store data in the LocalStorage of the browser or in the WeChat mini app. in the local cache of the program to meet the needs of different platforms. Since LocalStorage stores key-value pairs, the stored data needs to be converted into string form. You can use the JSON.stringify() function for conversion.

2. Use of LocalStorage

LocalStorage is a local storage method provided by HTML5. It can store string type data and can be saved for a long time, even if the browser is closed. lost. The following will introduce how uniapp uses LocalStorage.

1. Storing data

You can use the uni.setStorageSync() method to store data into LocalStorage. This method accepts two parameters. The first parameter is the stored key. name, the second parameter is the stored key value. As shown below:

uni.setStorageSync('name', '张三');
uni.setStorageSync('age', 18);

2. Read data

You can use the uni.getStorageSync() method to read data from LocalStorage. This method accepts one parameter, which is to read Get the key name and return the corresponding key value. As shown below:

var name = uni.getStorageSync('name');
var age = uni.getStorageSync('age');
console.log(name, age);

3. Delete data

You can use the uni.removeStorageSync() method to delete data in LocalStorage. This method accepts one parameter, which is the key to be deleted. name. As shown below:

uni.removeStorageSync('name');

4. Clear data

You can use the uni.clearStorageSync() method to clear all data in LocalStorage. After calling this method, all key-value pairs will be deleted. As shown below:

uni.clearStorageSync();

3. Local cache in WeChat applet

In addition to LocalStorage, uniapp also supports the use of local cache for data storage in WeChat applet. Local cache and LocalStorage Similarly, it is also a key-value pair storage method.

1. Storing data

You can use the uni.setStorageSync() method to store data into the local cache. This method accepts two parameters. The first parameter is stored Key name, the second parameter is the stored key value. As shown below:

uni.setStorageSync('name', '张三');
uni.setStorageSync('age', 18);

2. Read data

You can use the uni.getStorageSync() method to read data from the local cache. This method accepts one parameter, which is to Read the key name and return the corresponding key value. As shown below:

var name = uni.getStorageSync('name');
var age = uni.getStorageSync('age');
console.log(name, age);

3. Delete data

You can use the uni.removeStorageSync() method to delete the data in the local cache. This method accepts one parameter, which is the data to be deleted. Key name. As shown below:

uni.removeStorageSync('name');

4. Clear data

You can use the uni.clearStorageSync() method to clear all data in the local cache. After calling this method, all key values All pairs will be deleted. As shown below:

uni.clearStorageSync();

4. Summary

The above introduces the local storage method of uniapp, including LocalStorage and local cache. By using these methods, it can help developers better Manage data to make applications more stable and efficient. It is worth noting that the capacity of LocalStorage and local cache is limited. If too much data is stored, it may cause the application to slow down or crash, so local storage needs to be used rationally.

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