What can be put in vue functions

Vue is a modern JavaScript framework that uses a simple and intuitive set of syntax and API to enable developers to quickly build interactive web applications. In Vue, functions are a very important part as they provide developers with a way to manage and manipulate data in Vue applications. What to put in Vue's functions is discussed below.

First of all, a Vue function should contain code for processing data and business logic. For example, when the user enters some data, we should write a Vue function to handle that data. This function should be responsible for checking the validity of the data, converting the format of the data, storing the data on the server, etc. This kind of function is often called a processor function, which can be implemented using the built-in instructions and events provided by Vue:

new Vue({
  el: '#app',
  data: {
    message: ''
  },
  methods: {
    handleSubmit: function() {
      // 处理用户输入的数据
      console.log('用户输入的数据：' + this.message);
      // 将数据存储到服务器上
      // ...
    }
  }
})

In the above code, the handleSubmit function is a processor function that is bound to On the submit event of the HTML form. When the user submits the form, Vue will automatically call the handleSubmit function and pass it the data from the form. Within this function we can do some useful things like submit data to the server or update the view.

Secondly, a Vue function should also contain some code that can modify or update the state of the Vue application, such as changing data, calculated properties or listeners, etc. This kind of function is usually called an event handler function, which can be bound to DOM events using Vue's built-in instructions:

<div id="app">
  <p>{{ message }}</p>
  <button v-on:click="reverseMessage">反转</button>
</div>

new Vue({
  el: '#app',
  data: {
    message: 'Vue.js'
  },
  methods: {
    reverseMessage: function() {
      // 反转消息
      this.message = this.message.split('').reverse().join('');
    }
  }
})

In the above code, we define an event handler named reverseMessage Converter function, which is bound to the click event of the HTML button. When the user clicks the button, Vue will automatically call the reverseMessage function, which will reverse the message data and update the view.

Finally, a Vue function should also contain some code related to the Vue life cycle, such as hook functions that are executed when a Vue instance is created, updated, or destroyed. These functions can provide some very useful functionality, such as cleaning up resources when the component is destroyed or recalculating the view when the component is updated. In the following code, we define two life cycle hook functions: created and beforeDestroy:

new Vue({
  el: '#app',
  created: function() {
    // 组件被创建时调用
    console.log('组件被创建了');
  },
  beforeDestroy: function() {
    // 组件被销毁时调用
    console.log('组件被销毁了');
  }
})

In short, it is very important to put what content in the Vue function, because these functions represent the content of your Vue application. Core logic and functionality. Whether it is processing data, modifying state, or code related to the Vue life cycle, it should be organized and written correctly to ensure that your Vue application remains stable and reliable during development and maintenance.

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