What is the hook of vue writing method?

Vue is a popular JavaScript framework that can be used for building web applications. A Vue component is composed of multiple methods and hooks. Due to the special nature of hooks, Vue life cycle functions are called hook functions. In Vue, there are many hook functions you can use. In this article, we will introduce some methods and hooks in Vue.

1. Basic method
   The most basic method in Vue is the data method. These methods are used to process data in Vue components. These methods will be called when the data changes. A common data method is the update method, whose purpose is to update data.

data () {
  return {
    message: 'Hello world!'
  }
},
methods: {
  update: function () {
    this.message = 'Updated Message!'
  }
}

2. Life cycle hook
   The life cycle of Vue components can be divided into three stages: creation, update and destruction. Hooks play an important role in these stages. There are methods that can be used at each stage.

2.1 Creation Phase
In the creation phase, there are many application methods and hooks. The main hook functions in the creation phase are:

• beforeCreate: This hook function is called when the Vue instance is created.
• created: This hook function is called after the Vue instance is created. During this stage, you can perform data acquisition and other operations.
• beforeMount: This hook function is called before the Vue component is mounted to the page. In this hook, you can perform some preparatory work, such as calculating the position of DOM nodes and obtaining the size of DOM elements.

2.2 Update phase
In the update phase, there are mainly the following hook functions:

• beforeUpdate: This hook function is called before the Vue component updates data. In this hook, you can perform some data operations.
• updated: This hook function is called after the Vue component data is updated. During this stage, you can perform DOM operations.

2.3 Destruction phase
In the destruction phase, there are mainly the following hook functions:

• beforeDestroy: This hook function is called before the Vue component is destroyed. In this hook, you can perform some data cleaning work.
• destroyed: This hook function is called after the Vue component is destroyed. In this hook, you can do some other cleanup work.

created() { 
  console.log('created')
},
mounted() {
  console.log('mounted')
},
beforeUpdate() {
  console.log('beforeUpdate')
},
updated() {
  console.log('updated')
},
beforeDestroy() {
  console.log('beforeDestroy')
},
destroyed() {
  console.log('destroyed')
}

3. Vue Mixins
   Vue Mixins are a way to reuse code in Vue components. Mixins are called mixing, which means mixing some methods and data into Vue components. In Vue components, you can use these Mixins.

const myMixin = {
  methods: {
    alertMessage() {
      alert("Hello World");
    }
  }
};

//在Vue组件中使用Mixin
Vue.component("myComponent", {
   mixins: [myMixin],
   created() { 
      this.alertMessage();
   }
});

Mixed objects are merged when the Vue component is created, so the properties and functions of the mixed object can be overridden in the Vue component.

4. Vue plug-in
   Vue plug-in is a way to expand the functionality of Vue. Vue plugins can provide global methods or directives.

Vue.prototype.$alert = function (message) {
  alert(message);
};

Vue.directive('focus', {
  inserted: function (el) {
    el.focus()
  }
})

5. Summary
   Vue components are composed of methods and hooks. In this article, we introduced Vue’s basic methods, life cycle hooks, Vue Mixins and Vue plug-ins. Through these methods, developers can create Vue components more conveniently and provide a better user experience. However, while using these methods, developers need to consider performance issues and code maintainability issues.

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