to strings, and comparison and logical operations (
for instance, the following statement outputs
document.write(13 + 2)
The following sections introduce the various operators.
Arithmetic operators are used to perform mathematics. You can use them for the main four operations (addition, subtraction, multiplication, and division), as well as to find the modulus (the remainder after a division) and to increment or decrement a value (see Table 13-2).
Modulus (division remainder)
The assignment operators are used to assign values to variables.
They start with the very simple,
and move on to
-= , and so on. The operator
+= adds the value on the right side to the
variable on the left, instead of totally replacing the value on the
left. Thus, if
count starts with the
6, the statement:
count += 1
7, just like the more familiar assignment
count = count + 1
Table 13-3 lists the various assignment operators available.