How to adjust vue mode

Vue.js is a popular JavaScript framework that uses the MVVM pattern to organize code. It separates data, views and logic, and provides declarative data binding and a composable component system. The responsive system of Vue.js is one of its biggest features, which is that when the data changes, the UI will automatically update. In Vue.js, we can debug our application in various ways.

1. Chrome DevTools

Chrome DevTools is a tool that comes with the Chrome browser. It provides a wealth of debugging functions, including:

• Elements: In the Elements panel, we can inspect and edit DOM elements, including those in Vue components. By checking the "Preserve log" option, you can prevent the console from automatically clearing the log when data is updated.
• Components: In the Components panel, we can view the component tree and expand each component to view its status, properties, events and other information. We can also jump within the context of a component to better understand its behavior.
• Console: In the Console panel, we can run JavaScript code directly and check the status and properties of the Vue instance.
• Sources: In the Sources panel, we can view the JavaScript source code and set breakpoints for debugging.

2. Vue DevTools

Vue DevTools is a standalone browser extension that can be used in browsers such as Chrome, Firefox, Safari and Edge. It provides powerful debugging functions for Vue.js applications, including:

• Component tree: In the component tree, we can view information such as the status, properties, and events of each component, as well as their father-son relationship.
• Data: In the data tab, we can view data, computed, watch and other data in the current Vue instance.
• Events: In the events tab, we can view all events in the component (including custom events) and their execution order.
• Debug information: In the debug information tab, we can view the Vue version, running mode, error information, etc.

3. Vue.js debugging tool

Vue.js officially provides a debugging tool that is very useful when developing Vue.js applications. To use it, we only need to add a special debugging option to the Vue instance:

Vue.config.debug = true;

Once debugging mode is enabled, Vue.js will output detailed debugging information in the console, including data updates, events Triggering, rendering and performance statistics, etc.

4. Console.log

If we want to quickly view the data in the Vue instance or the status of a component, we can also use console.log. In the component code, we can use the "$data" shortcut to get the data in the Vue instance. For example:

export default {
  data() {
    return {
      message: 'Hello Vue!'
    }
  },
  created() {
    console.log(this.$data.message);
  }
}

When the Vue instance is created, it will output "Hello Vue!" in the console.

Summary

Debugging Vue.js applications is an integral part of the development process. With the help of Chrome DevTools, Vue DevTools, Vue.js debugging tools and console.log, we can locate and solve problems more easily and improve our development efficiency.

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