JS comma-expression

The comma operator (,) in JavaScript in JavaScript is the sequential execution of two expressions. How to use:

expression1, expression2

where expression1 is any expression.
Expression2 is any expression.

The comma operator in JavaScript, which performs the expression on either side of it in the left-to-right order, and gets the value of the right-hand expression. , the most common purpose of an operator is to use it in an increment expression for a for loop. For example: for

(i = 0; i <; i++, J + +)
{
K = i + j;

each time the end of the loop is passed, the For statement allows only a single expression to be executed. , an operator is used to allow multiple expressions to be treated as a single expression, thereby circumventing the restriction.

JS comma-expression