JavaScript prohibited full-width

In Web development, JavaScript is a very important scripting language. It can realize page interactive effects, form verification, dynamic loading of data and other functions, which greatly enriches the functions of web applications. However, problems with full-width characters easily occur in JavaScript, causing various errors in the code.

What are full-width characters?

Full-width characters refer to characters that occupy two bytes in the Chinese operating system. Correspondingly, English letters and numbers that occupy one byte are called half-width characters.

Why ban full-width characters?

JavaScript is a language that does not distinguish between full-width and half-width characters, but in JavaScript strings and variables, if full-width characters appear, it will cause various problems, such as:

1. Characters String length calculation error: Since the length of full-width characters is twice that of half-width characters, an error will occur if the string contains the length of full-width characters.

2. Variable name error: Variable names with full-width characters and half-width characters cannot be mixed, otherwise unrecognizable errors will occur.

3. Code pollution: Programmers tend to use full-width characters when writing code, which leads to poor readability and maintainability of the code.

How to prohibit full-width characters?

Here are some ways to disable full-width characters in JavaScript.

1. Editor settings: Some commonly used code editors, such as Visual Studio Code, Sublime Text, Atom, etc., provide setting functions to warn and prohibit the input of full-width characters.

2. Regular expression: Use regular expression to determine whether the variable name contains full-width characters. If it does, an error will be prompted.

3. Automated tools: Automatic verification tools like ESLint, JSHint, TSLint, and Prettier can check whether full-width characters exist in the code and edit them.

4. Document conventions: As a rule for teamwork, formulate some document conventions and code specifications, and clearly prohibit the use of full-width characters.

Summary

Banning the use of full-width characters in JavaScript can improve the readability and maintainability of the code and reduce the possibility of errors. When writing JavaScript code, pay special attention to avoid full-width characters, and use the above methods to ensure the effect of the code.

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