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Microsoft® JScript™
+ Operator
 Language Reference 
Version 1 

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Used to sum two numbers or perform string concatenation.
result = expression1 + expression2

The + operator syntax has these parts:

Part Description
result Any variable.
expression1 Any expression.
expression2 Any expression.

The underlying subtype of the expressions determines the behavior of the + operator.

If Then
Both expressions are numeric or Boolean Add.
Both expressions are strings Concatenate.
One expression is numeric and the other is a string Concatenate.

For information on when a run-time error is generated by the + operator, see the Operator Behavior table.

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