How to cache data in uniapp

UniApp is a cross-platform development framework based on Vue.js and can be published to multiple platforms, such as iOS, Android and Web. In the development process, data caching is a very important link. This article will introduce how to cache data in UniApp, and attach corresponding code examples.

There are two main ways of data caching in UniApp: local storage and global variables.

1. Local Storage
Local storage saves data in the local storage space of the client so that the data can be restored when the user reopens the application. UniApp provides two APIs, uni.setStorageSync and uni.getStorageSync, for local storage.

1. uni.setStorageSync
   uni.setStorageSync is used to store data into local storage. It accepts two parameters: key and data. Among them, key is the key name of the data, and data is the value of the data. The sample code is as follows:

uni.setStorageSync('username', 'Tom');

2. uni.getStorageSync
   uni.getStorageSync is used to get data from local storage. It accepts one parameter: key, which represents the key name of the data to be obtained. The sample code is as follows:

var username = uni.getStorageSync('username');
console.log(username); // 输出：Tom

2. Global variables
Global variables refer to variables declared in the application that can be shared by multiple pages. In UniApp, we can save the data that needs to be cached in global variables so that multiple pages can share this data. The sample code is as follows:

1. Declare global variables in App.vue

export default {
  globalData: {
    username: 'Tom'
  },
  onLaunch() {
    // ...
  }
}

2. Use global variables in other pages

var app = getApp();
console.log(app.globalData.username); // 输出：Tom

It should be noted that when using global variables, you need to obtain the App instance first and access its globalData property.

To sum up, this article introduces two ways of data caching in UniApp: local storage and global variables. Through these two methods, we can easily store and obtain data in the application. I hope this article will help you with data caching in UniApp development.

Reference materials:

1. UniApp official documentation-[Data cache](https://uniapp.dcloud.io/api/storage/storage)
2. UniApp Official documentation - [Global variables](https://uniapp.dcloud.io/frame?id=Global variables)

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