WeChat applets use local storage methods (wx.setStorageSync() and wx.getStorageSync())

The local storage of the WeChat applet can be realized by using the wx.setStorageSync() and wx.getStorageSync() methods. Here is an introduction to the process of using local storage.

1. Set data: Use the wx.setStorageSync() method to store data in the local storage in the form of key-value pairs. For example, to store a user name called "username" into local storage, the following code can be used:

wx.setStorageSync('username', 'user123');

1. Get data: Use the wx.getStorageSync() method to get data from local storage. For example, use the following code to get the previously set username data:

var username = wx.getStorageSync('username');
console.log(username); //输出'user123'

Returns undefined if the key-value pair does not exist.

1. Updating data: To update existing data, just re-use the wx.setStorageSync() method. For example, if you want to change the original "username" to "newUser", you can use the following code:

wx.setStorageSync('username', 'newUser');

1. Delete data: Use the wx.removeStorageSync() method to delete data from local storage. For example, if you want to delete the previously stored username data, you can use the following code:

wx.removeStorageSync('username');

1. Clear all data: Use the wx.clearStorageSync() method to clear all stored data in the local storage. For example, if you want to clear all data, you can use the following code:

wx.clearStorageSync();

In short, using local storage can help applets improve data reading speed and responsiveness, and enable applications to be used offline. However, it should be noted that local storage has a limited capacity, so too much data should not be stored.