Improve the readability of JavaScript code (basic article)

Multi-line annotations are used:

/* * * */

{} After Conditional control statement can improve code readability and error when modifying code

Line breaks and variable indentation in the code

An if conditional expression is best used in the form of a block of code, even if there is only one statement

The Var statement preferably appears at the top of the function body, and all variables in the function body should be declared in a separate VAR statement as the first statement of the function body.

Using a function definition expression instead of a function-definition statement

Improve the readability of JavaScript code (basic article)