How to save data using vuex in uniapp

Using vuex in uniapp can help us make data sharing and management between components more convenient and concise. How to save data in vuex is also an important skill we need to master. The following will introduce in detail how to use vuex to save data in uniapp.

1. Define state in vuex

In vuex, we need to first define a store, which is a global state manager, including state, mutations, actions, Getters and other properties and methods. And state is the key to us saving data.

In uniapp, we can create an index.js file in the store folder in the src directory and define state in it. For example:

const state = {
  username: ''
}

Here, we define a state object that contains a username attribute and initialize it to an empty string. This username is the data we want to save in vuex.

2. Use mutations to modify state

Next we need to define a mutation. In mutations, we can define different operations, such as adding data, modifying data, and deleting data. wait. Here, we take modifying data as an example to demonstrate how to save data to state.

In the src/store/index.js file, define the mutations method as follows:

const mutations = {
  setUsername (state, payload) {
    state.username = payload
  }
}

Here, we define a setUsername method that receives two parameters: state and payload. The state is the state object we defined in the previous step, and the payload is the modified data.

The setUsername method achieves the purpose of saving data to the state by modifying the username attribute in the state object.

3. Using vuex in components

Now that we have defined and saved the data in vuex, we need to use it in the component.

In the component we need to use, we need to introduce vuex and use mapState and other methods to obtain the data in the state so that it can be used in the component.

import { mapState } from 'vuex'

export default {
  computed: {
    ...mapState(['username'])
  },
  mounted () {
    console.log(this.username) // 打印出保存在vuex中的数据
  }
}

Here, we use the mapState method to map the data in vuex to the computed property in the component, and give it an alias as username, so that we can use this.username in the component to get the data saved in vuex The data.

4. Modify the data in vuex in the component

In the previous step, we have been able to obtain the data saved in vuex in the component. The next step is to process the data. The logic of how to modify the data in vuex in the component.

In the component, we can submit the methods in mutations and modify the data in state through this.$store.commit('mutations method name', data).

methods: {
  modifyUsername () {
    this.$store.commit('setUsername', 'newUsername')
  }
}

Here, we define a modifyUsername method. When we call it in the component, we can submit the setUsername method through this.$store.commit method and pass in a new data newUsername. In this way, the data saved in vuex can be modified.

5. Summary

Through the above steps, we can learn to use vuex to save and manage data in uniapp. The steps are simple and not difficult in practice. When writing large or complex applications, using vuex can better improve the maintainability and readability of the code, and also speed up the development process.

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