How to set variables in Uni-app

Uni-app is a cross-platform application development framework using the Vue.js framework. It can quickly develop native applications on different platforms. When developing Uni-app applications, it is often necessary to set variables in the code to implement some functions. This article will detail how to set variables in Uni-app.

1. Set variables in Vue components

Vue.js is the framework that Uni-app is based on, and components are one of the core concepts of the Vue.js framework. In Vue components, variables can be set through the data attribute. Taking the sample component as an example, the code is as follows:

<template>
  <div>{{ message }}</div>
</template>

<script>
export default {
  data() {
    return {
      message: 'Hello World!'
    }
  }
}
</script>

In the above code, a variable message is set in the component, its initial value is "Hello World!", and then it is passed {{message}} in the template Reference this variable so that "Hello World!" will be displayed on the page.

2. Set variables in global variables

In Uni-app, you can achieve data sharing between different components by defining global variables in main.js. The code is as follows:

// main.js
import Vue from 'vue'
import App from './App.vue'
Vue.prototype.$global = {
  message: 'Hello World!'
}
Vue.config.productionTip = false
App.mpType = 'app'

const app = new Vue({
  ...App
})
app.$mount()

In the above code, Vue.prototype.$global is used to define the global variable, and then the variable can be referenced through this.$global in App.vue.

3. Use vuex to manage variables

vuex is a plug-in in the Vue framework specifically used to manage state, and can be used to share data state. In Uni-app, you can use vuex to manage variables. The following is a simple example:

// store/index.js
import Vue from 'vue'
import Vuex from 'vuex'
Vue.use(Vuex)

export default new Vuex.Store({
  state: {
    message: 'Hello World!'
  },
  mutations: {
    updateMessage(state, message) {
      state.message = message
    }
  }
})

// App.vue
<template>
  <div>{{ message }}</div>
</template>

<script>
export default {
  computed: {
    message() {
      return this.$store.state.message
    }
  },
  mounted() {
    this.$store.commit('updateMessage', 'Hello Uni-app!')
  }
}
</script>

In the above code, we use Vuex to define a state object, which contains a variable message. Then in the component, we reference the variable by defining message in computed. When mounted, we modify the variable through this.$store.commit('updateMessage', 'Hello Uni-app!') value. In this way, "Hello Uni-app!" will be displayed on the page.

To sum up, these three methods can be used to set variables. In practical applications, it needs to be used flexibly according to the actual situation. At the same time, it should be noted that in order to ensure the readability and maintainability of the code, certain coding standards and comment standards should be followed.

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