How to use the function function in vue

The function function in Vue is used to define reusable component methods: define a method object methods and define the function function in it. Parameters can be added after the method name, separated by commas. You can use the return statement to return a value. Arrow functions can be used to simplify single-line functions. Computed properties and listeners are also methods used for specific scenarios.

Usage of function function in Vue

function Function It is a way to define component methods in Vue. It allows you to create reusable code blocks and call them in different components.

Usage

<code class="js">methods: {
  myFunction() {
    // 函数实现
  }
}</code>

The above code defines a method named myFunction, which can be used in the component.

Example

<code class="js"><template>
  <button @click="myFunction()">Click Me</button>
</template>

<script>
  export default {
    methods: {
      myFunction() {
        console.log('Button clicked!');
      }
    }
  }
</script></code>

In this example, when the user clicks the button, it will call the myFunction method and log a message in the console .

Parameters

function Functions can accept parameters by listing them after the function name.

<code class="js">methods: {
  myFunction(param1, param2) {
    // 函数实现
  }
}</code>

Return value

function A function can return a value. Just use the return statement.

<code class="js">methods: {
  myFunction() {
    return 'Hello world!';
  }
}</code>

Other features

• Arrow functions: Arrow functions are a more concise way of defining functions. It can be used for single-line functions.

<code class="js">methods: {
  myFunction: () => {
    // 函数实现
  }
}</code>

• Computed Properties: Computed properties are similar to methods, but they are automatically recalculated based on reactive data.

<code class="js">computed: {
  myComputedProperty() {
    // 计算属性实现
  }
}</code>

• Listener: A listener is a function that responds to data changes on a Vue instance.

<code class="js">watch: {
  myDataProperty(newValue, oldValue) {
    // 数据变化时的侦听器实现
  }
}</code>

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