How to use local cache in uniapp

Using cache to store application data in mobile applications has become a common operation. This can not only improve the response speed of the application, but also save user traffic. When developing with uniapp, we can achieve this goal by using the local cache that comes with uniapp.

The local cache in uniapp refers to localStorage and sessionStorage in the client browser, which can be used to store and access string type data on the client. Both localStorage and sessionStorage are stored in the client's browser and can persist after the browser is closed until the data is manually cleared or the expiration time is reached.

Below we will introduce how uniapp uses local cache to store and access data.

1. Set the local cache

To set the local cache, we can use the $setStorage and $setStorageSync methods that come with uniapp.

$setStorage method

uni.$setStorage('key', 'value', function () {
  console.log('数据存储成功')
})

$setStorageSync method

uni.$setStorageSync('key', 'value')

The above code stores "value" into "key". The first method is an asynchronous method, and the callback function will be executed when the data is stored successfully. The second method is a synchronous method and will directly return the stored result.

2. Get local cache data

To get local cache data, we can use the $getStorage and $getStorageSync methods that come with uniapp.

$getStorage method

uni.$getStorage('key', function (res) {
  console.log(res.data)
})

$getStorageSync method

var data = uni.getStorageSync('key')
console.log(data)

The above code will retrieve the stored data from "key". The first method is asynchronous, and the callback function will be executed after the data is successfully obtained. The second method is synchronous and will directly return the result.

3. Delete local cache data

If we want to delete local cache data, we can use the $removeStorage and $removeStorageSync methods that come with uniapp.

$removeStorage method

uni.$removeStorage('key', function () {
  console.log('数据删除成功')
})

$removeStorageSync method

uni.$removeStorageSync('key')

The above code deletes the data stored in "key". The first method is asynchronous, and the callback function will be executed after the deletion is successful. The second method is synchronous and will directly return the deletion result.

4. Clear local cache data

If we want to clear all local cache data, we can use the $clearStorage and $clearStorageSync methods that come with uniapp.

$clearStorage method

uni.$clearStorage(function () {
  console.log('本地缓存已清除')
})

$clearStorageSync method

uni.$clearStorageSync()

The above code will clear all data in localStorage and sessionStorage in the client browser. The first method is asynchronous, and the callback function will be executed after the data is cleared successfully. The second method is synchronous and will directly return the clear result.

Summary

Local cache is a very useful tool when developing uniapp applications. By using the local cache that comes with uniapp, we can store data on the client and obtain the data when needed, thereby improving the response performance of the application and saving user traffic.

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