vue-cli error location

Vue-cli is a scaffolding tool used to quickly develop Vue.js projects. It can help us quickly build a basic Vue.js project structure and provides many commonly used functions and plug-ins. However, when using vue-cli to develop projects, you may encounter various errors. At this time, we need to quickly and accurately locate errors and resolve them to ensure that the project can proceed smoothly.

This article will introduce several common vue-cli errors and give corresponding solutions to help readers better understand and use the vue-cli tool.

1. Failed to connect to localhost:8080

This error usually occurs when starting the project. The reason is that the port is occupied or the set port is inconsistent with the actual running port.

Solution:

1. Check whether the port is occupied. You can use the netstat -ano | findstr "8080" command to query.

2. Modify the port number, find the dev field in the config/index.js file, and modify its port attribute to other available Just the port number.

2. "Module not found" or "Cannot find module"

This error is usually caused by an error in the module name or path. Vue-cli will only use relative paths by default. To search for modules, you need to manually specify the path for modules under other paths.

Solution:

1. Check whether the module name is correct.

2. Confirm whether the module path is correct.

For example, if you want to introduce a myModule.js module located in the src directory, you can write like this:

import myModule from '@/myModule'

3. An error occurred in "npm ERR! code"

This error usually occurs because npm fails to install the module. The reason may be an unstable network or even a problem with the module library itself.

Solution:

1. Check whether the network connection is normal.

2. Try to use Taobao mirror to install the module: npm install -g cnpm --registry=https://registry.npm.taobao.org, and then use cnpmReplace the npm command.

This can improve the speed of module installation, and also avoid problems with certain module libraries.

4. "Unexpected token" or "SyntaxError"

This error is usually caused by irregular code writing. Vue-cli uses ESLint by default to detect code specifications. If the code does not comply with the specifications, this error will occur.

Solution:

1. Check the error message to determine the error code.

2. Modify the code according to the ESLint specification.

For example, ESLint requires that curly braces must be added to the if statement. If not, an Unexpected token error will be prompted.

5. "Cannot read property" or "TypeError"

This error is usually caused by using an undefined or unassigned variable or property.

Solution:

1. Check whether there are undefined or unassigned variables or properties in the code.

2. Confirm whether the type of the variable or attribute is correct.

For example, the following example will cause a TypeError error:

let value;
console.log(value.length);

In this example, since value is not assigned, its value is undefined, and undefined does not have a length attribute, so it will cause TypeError.

Summary

The above are several common errors and their solutions when using Vue-cli. When we encounter similar errors during the development process, we can refer to the above solution to quickly locate the error and improve development efficiency.

At the same time, we should always maintain a learning attitude and have a deep understanding of the principles and usage of the Vue-cli tool, so that we can better use the Vue-cli tool to develop high-quality Vue.js applications.

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