Regarding how to implement secondary linkage in Vue, the first value is selected by default

Using ECharts in Vue makes it easy to add data visualization capabilities to your application. Specific steps include: installing ECharts and Vue ECharts packages, introducing ECharts, creating chart components, configuring options, using chart components, making charts responsive to Vue data, adding interactive features, and using advanced usage.

Question: What is the role of export default in Vue? Detailed description: export default defines the default export of the component. When importing, components are automatically imported. Simplify the import process, improve clarity and prevent conflicts. Commonly used for exporting individual components, using both named and default exports, and registering global components.

The Vue.js map function is a built-in higher-order function that creates a new array where each element is the transformed result of each element in the original array. The syntax is map(callbackFn), where callbackFn receives each element in the array as the first argument, optionally the index as the second argument, and returns a value. The map function does not change the original array.

Vue hooks are callback functions that perform actions on specific events or lifecycle stages. They include life cycle hooks (such as beforeCreate, mounted, beforeDestroy), event handling hooks (such as click, input, keydown) and custom hooks. Hooks enhance component control, respond to component life cycles, handle user interactions and improve component reusability. To use hooks, just define the hook function, execute the logic and return an optional value.

The Validator method is the built-in validation method of Vue.js and is used to write custom form validation rules. The usage steps include: importing the Validator library; creating validation rules; instantiating Validator; adding validation rules; validating input; and obtaining validation results.

In Vue, the change event can be disabled in the following five ways: use the .disabled modifier to set the disabled element attribute using the v-on directive and preventDefault using the methods attribute and disableChange using the v-bind directive and :disabled

Style isolation in Vue components can be achieved in four ways: Use scoped styles to create isolated scopes. Use CSS Modules to generate CSS files with unique class names. Organize class names using BEM conventions to maintain modularity and reusability. In rare cases, it is possible to inject styles directly into the component, but this is not recommended.

There are three ways to introduce ECharts into Vue.js: Install through npm Introduce through CDN Use the Vue ECharts plug-in Detailed steps: Create a chart container Introduce ECharts Initialize the chart instance Set chart options and data destroy chart instance (optional)