How to write methods in methods in vue

In Vue, the steps for writing methods in the Methods option are as follows: Define the methods object in the JavaScript block of components. Methods are defined using function expressions, using camelCase notation and without parameters. Within the method body, use the this keyword to access the component instance. Use the v-on directive to call a method from a template, specifying the method name as an argument. Methods can be synchronous or asynchronous, with asynchronous methods declared using the async keyword.

Writing methods in Methods in Vue

In Vue, the methods option is used Used to define reusable methods that can be called from the component's template. The following steps should be followed when writing these methods:

1. Define the method in the methods option

Create a new method named methods in the JavaScript code block of the component object:

<code class="js">export default {
  methods: {
    // 方法定义
  }
}</code>

2. Use function expressions to define methods

In the methods object, use function expressions to define methods . The method name should use camel case, and the function itself has no parameters:

<code class="js">methods: {
  myMethod() {
    // 方法体
  }
}</code>

3. To access this instance

In the method body, you can use this Keywords access component instances and their data and methods. For example, to access a component's data object, you would use this.data:

<code class="js">methods: {
  myMethod() {
    console.log(this.data.message);
  }
}</code>

4. Calling method

# from a template ##When calling a method from a component template, use the

v-on directive and specify the method name as the parameter:

<code class="html"><button @click="myMethod">点击</button></code>

5. Synchronous method vs. asynchronous method

Vue methods can be synchronous or asynchronous. Synchronous methods execute immediately, while asynchronous methods execute asynchronously by returning a Promise object. Use the

async keyword to declare an asynchronous method:

<code class="js">methods: {
  async myAsyncMethod() {
    // 异步代码
  }
}</code>

Note:

The method name must be unique.
• Methods can accept optional parameters, but these should be explicitly specified in the method definition.
• Methods in Methoden can call each other.
• When data is modified in a method, responsive changes should be triggered so that the template can be updated.

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