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:
export default { methods: { // 方法定义 } }
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:
methods: { myMethod() { // 方法体 } }
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
:
methods: { myMethod() { console.log(this.data.message); } }
4. Calling method
# from a template ##When calling a method from a component template, use thev-on directive and specify the method name as the parameter:
<button @click="myMethod">点击</button>
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 theasync keyword to declare an asynchronous method:
methods: { async myAsyncMethod() { // 异步代码 } }
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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