Vue closes the page and clears local storage

With the continuous updating and iteration of front-end frameworks, Vue.js has gradually become one of the standard features of front-end development. In the development process of Vue.js, we often use local storage (localStorage) to store some user information or some cache data. However, after the user closes the page, these locally stored data often cause security risks or affect the operation of other applications. To do this, we need to think about how to clear local storage when closing the page in Vue.js.

General practice

In Vue.js, to clear local storage, you need to use localStorage.removeItem() to delete it. When we add storage to the page, use the localStorage.setItem() method to store the value and corresponding key. For example:

localStorage.setItem('user_name', '张三');

When we want to delete a key-value pair, use the localStorage.removeItem() method and pass in the key name. For example:

localStorage.removeItem('user_name');

Under normal circumstances, we can listen to the page closing event, determine when the page is closed, and then perform the operation of clearing the storage. For example:

window.onbeforeunload = function(){
    localStorage.removeItem('user_name');
}

But in Vue.js, we cannot directly use the window object to listen to the page closing event. So we need to find some Vue.js solutions.

Vue plug-in

Vue plug-in is an extension mechanism of Vue.js, which allows us to encapsulate some functions into plug-ins, which is convenient for us to call in Vue.js components. So we can try to write a Vue plug-in that listens to the page close event and clears the local storage.

First, we need to write a Vue plug-in to encapsulate the operation of clearing local storage. In the plug-in, we can use Vue.prototype to extend the prototype of Vue.js to facilitate calling in components. For example:

const storageCleaner = {
  install(Vue) {
    Vue.prototype.$cleanStorage = function () {
      localStorage.clear();
    }
  }
}

Then, we can use it in Vue.js. First, you need to introduce the plug-in and register it in the initialization option of Vue.js. For example:

import Vue from 'vue'
import App from './App.vue'
import storageCleaner from './plugins/storageCleaner'

Vue.config.productionTip = false
Vue.use(storageCleaner)

new Vue({
  render: h => h(App),
}).$mount('#app')

In the component, we can clear the local storage through the $cleanStorage() method. For example:

export default {
  methods: {
    logout() {
      //清除本地存储
      this.$cleanStorage();
    }
  }
}

However, this method still has certain limitations. Because Vue.js does not provide a component destruction operation similar to AngularJS's $scope.$on('$destroy', function() {}), we still need to additionally consider how to destroy components under certain circumstances.

Vue.mixin

Vue.mixin is another extension mechanism of Vue.js that allows us to mix in multiple components to achieve code reuse. We can write a global mixin and listen to the beforeDestory life cycle hook in it, and clear the local storage in this hook.

First, we need to write a global mixin and listen to the beforeDestory life cycle hook in it. For example:

const storageCleanerMixin={
    beforeDestroy(){
        localStorage.clear();
    }
}

Then, we need to do a global mixin in the initialization options of Vue.js. For example:

import Vue from 'vue'
import App from './App.vue'
import storageCleanerMixin from './mixins/storageCleanerMixin'

Vue.mixin(storageCleanerMixin)

new Vue({
  render: h => h(App),
}).$mount('#app')

In this way, we do not need to write a method to clear local storage in each component. Just listen to the beforeDestory lifecycle hook in the global mixin. However, this method also has some disadvantages, that is, it may affect the life cycle of some components and lead to some abnormal situations.

Summary

The above are two methods for clearing local storage in Vue.js. They are using Vue plug-in and using Vue.mixin. Both methods have their own advantages and disadvantages, and you can choose according to actual needs and business scenarios. At the same time, no matter which method is used, you must pay attention to the security of the data during the process of clearing local storage to avoid information leakage or other security issues.

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