Cara menggunakan tips for understanding javascript

Question

Vue.js is a popular JavaScript library for building web application user interfaces and Visual Studio Code has built-in support for the Vue.js building blocks of HTML, CSS, and JavaScript. For a richer Vue.js development environment, you can install the Vetur extension which supports Vue.js IntelliSense, code snippets, formatting, and more.

Table of Contents Show

Welcome to Vue
Vetur extension
IntelliSense
Go to Definition, Peek definition
Hello World
Other extensions

Welcome to Vue

We'll be using the Vue CLI for this tutorial. If you are new to the Vue.js framework, you can find great documentation and tutorials on the vuejs.org website.

To install and use the Vue CLI as well as run the Vue application server, you'll need the Node.js JavaScript runtime and npm (the Node.js package manager) installed. npm is included with Node.js which you can install from Node.js downloads.

Tip: To test that you have Node.js and npm correctly installed on your machine, you can type node --version and npm --version.

To install the vue/cli , in a terminal or command prompt type:

npm install -g @vue/cli

This may take a few minutes to install. You can now create a new Vue.js application by typing:

vue create my-app

where my-app is the name of the folder for your application. You will be prompted to select a preset and you can keep the default (babel, eslint), which will use Babel to transpile the JavaScript to browser compatible ES5 and install the ESLint linter to detect coding errors. It may take a few minutes to create the Vue application and install its dependencies.

Let's quickly run our Vue application by navigating to the new folder and typing

vue create my-app

0 to start the web server and open the application in a browser:

cd my-app
npm run serve

You should see "Welcome to your Vue.js App" on http://localhost:8080 in your browser. You can press Ctrl+C to stop the

vue create my-app

1 server.

To open your Vue application in VS Code, from a terminal (or command prompt), navigate to the my-app folder and type

vue create my-app

3:

cd my-app
code .

VS Code will launch and display your Vue application in the File Explorer.

Vetur extension

Now expand the

vue create my-app

4 folder and select the

vue create my-app

5 file. You'll notice that VS Code doesn't show any syntax highlighting and it treats the file as Plain Text as you can see in the lower right Status Bar. You'll also see a notification recommending the Vetur extension for the

vue create my-app

6 file type.

The Vetur extension supplies Vue.js language features (syntax highlighting, IntelliSense, snippets, formatting) to VS Code.

From the notification, press Install to download and install the Vetur extension. You should see the Vetur extension Installing in the Extensions view. Once the installation is complete (may take several minutes), the Install button will change to the Manage gear button.

Now you should see that

vue create my-app

6 is a recognized file type for the Vue language and you have language features such as syntax highlighting, bracket matching, and hover descriptions.

IntelliSense

As you start typing in

vue create my-app

5, you'll see smart suggestions or completions both for HTML and CSS but also for Vue.js specific items like declarations (

vue create my-app

9,

cd my-app
npm run serve

0) in the Vue

cd my-app
npm run serve

1 section:

and Vue properties (

cd my-app
npm run serve

2,

cd my-app
npm run serve

3) in the

cd my-app
npm run serve

4 section:

Go to Definition, Peek definition

VS Code through the Vue extension language service can also provide type definition information in the editor through Go to Definition (F12) or Peek Definition (⌥F12 (Windows Alt+F12, Linux Ctrl+Shift+F10)). Put the cursor over the

cd my-app
npm run serve

5, right click and select Peek Definition. A will open showing the

cd my-app
npm run serve

5 definition from

cd my-app
npm run serve

7.

Press Escape to close the Peek window.

Hello World

Let's update the sample application to "Hello World!". In

vue create my-app

5 replace the HelloWorld component

cd my-app
npm run serve

9 custom attribute text with "Hello World!".

<template>
  <div id="app">
    <img src="./assets/logo.png">
    <HelloWorld msg="Hello World!"/>
  </div>
</template>

Once you save the

vue create my-app

5 file (⌘S (Windows, Linux Ctrl+S)), restart the server with

vue create my-app

0 and you'll see "Hello World!". Leave the server running while we go on to learn about Vue.js client side debugging.

Tip: VS Code supports Auto Save, which by default saves your files after a delay. Check the Auto Save option in the File menu to turn on Auto Save or directly configure the
cd my-app
code .
2 user setting.

Linting

Linters analyze your source code and can warn you about potential problems before you run your application. The Vue ESLint plugin (eslint-plugin-vue) checks for Vue.js specific syntax errors which are shown in the editor as red squigglies and are also displayed in the Problems panel (View > Problems ⇧⌘M (Windows, Linux Ctrl+Shift+M)).

Below you can see an error when the Vue linter detects more than one root element in a template:

Debugging

You can debug client side Vue.js code with the built-in JavaScript debugger. You can learn more from the Vue.js debugging in VS Code recipe on the VS Code debugging recipes site.

Note: There are currently issues with the sourcemaps generated by vue-cli, which cause issues with the debugging experience in VS Code. See https://github.com/vuejs/vue-loader/issues/1163.

Another popular tool for debugging Vue.js is the vue-devtools plug-in.

Other extensions

Vetur is only one of many Vue.js extensions available for VS Code. You can search in the Extensions view (⇧⌘X (Windows, Linux Ctrl+Shift+X)) by typing 'vue'.

There are also Extension Packs which bundle extensions that other people have found useful for Vue.js development.

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