An article introducing Vue syntax error checking techniques

Vue is a very popular front-end framework. It is simple, flexible, and efficient, and is loved by more and more developers. However, due to the complexity of Vue syntax, developers will inevitably make syntax errors during use, which will cause the application to fail to run properly. In order to avoid this situation from happening, this article will introduce Vue syntax error checking techniques.

1. Install Vue-cli

First, we need to install Vue-cli. Vue-cli is an official scaffolding tool of Vue. By using it, we can quickly build Vue application development environment. The installation command is as follows:

npm install -g vue-cli

2. Use ESLint

ESLint is an open source JavaScript syntax checking tool, which can help us detect code errors. grammatical errors, style issues, etc. In order to use ESLint to inspect Vue code, we need to install the ESLint and Vue plugins first.

1. Install ESLint:

npm i -D eslint

2. Install Vue plug-in:

npm i -D eslint-plugin-vue

3. Create the .eslintrc.js file:

In the root directory of the Vue project, create the .eslintrc.js file and configure the following Copy the code into this file:

module.exports = {
root: true,
env: {

node: true

},
extends: [

'plugin:vue/essential',
'@vue/standard'

],
parserOptions: {

parser: 'babel-eslint'

},
rules: {

// 这里可以添加自己额外的规则

}
}

Configuration instructions as above:

• root: Set to true to indicate that the file is the root configuration file, and ESLint will stop looking for configuration in the parent file.

• env: Specify the environment in which the code runs. Here it is set to node, which means it runs in the Node.js environment.

• extends: Inherited ESLint rule configuration, two rule configurations, plugin:vue/essential and @vue/standard are used here.

• parserOptions: Specify parser options. babel-eslint is a parser wrapper that uses the Babel parser. The babel-eslint parser parsing is used here.

• rules: You can add your own ESLint rules.

4. Install VS Code extension

In order to automatically check errors in the code editor and give error prompts, you need to install the ESLint extension in VS Code.

3. Code inspection

After completing the above steps, we can start checking the code. Open the Vue project in VS Code, and the ESLint extension will automatically detect errors in the project and give error prompts.

At this point, as long as you open a Vue component in VS Code, you can see the error message shown in the picture below.

As shown in the picture above, a small red dot will appear on the left side of the code window. Moving the mouse over it will display an error message. We can correct the code based on the error message.

In addition, if we want to ignore the error checking of certain lines, we can add comments at the end of the corresponding lines. The comment content is // eslint-disable-line:

<script><br> export default {</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">data () {   return {     // eslint-disable-line     msg: 'Hello, World!'   } }</pre><div class="contentsignin">Copy after login</div></div> <p>}<br></script>

4. Summary

Through the above operations, we can easily check the Vue code for syntax errors. This method can help us find syntax errors as early as possible and correct them in time, thereby speeding up development and improving code quality. It is worth mentioning that ESLint can also help us check code style, making our code more concise, readable, and easy to maintain.

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