JavaScript Expressions and operators

1. Expression type

After you have defined the variables, you can assign them, a series of operations, such as change, computation, and so on, usually called an expression, that is, a set of variables, constants, Boolean, and operators, so that an expression can be divided into arithmetic expressions, string expressions, assignment expressions, and Boolean expressions.

2, operator

The functions and usages of the operators are shown in table 2-1.

Table 2-1 commonly used operators in JavaScript

Type	Symbol	Description	Example	Results
Arithmetic operators	—	Negative	-3	-3
*	Multiplication	5*3	15
/	Division	5/2	2.5
%	Take more	5mod2	1
+	Addition	5+3	8
—	Subtraction	5-3	2
|	Bitwise OR operation	5|3	7
—	Bitwise AND Operation	5&3	1
<<	Move left	5<<3	40
>>	Move right	5>>1	2
~	Take a supplement	~5	-6
++	Accumulator	A=5 a++	A=6
--	Decline	A=5 a--	A=4
Character operators	+	string concatenation	"A" + "B"	"AB"
Comparison operators	= =	Equals	5==3	False
!=	Not equal to	5!=3	True
<	Less than	5<3	False
>	Greater than	5>3	True
<=	Less than or equal to	5<=3	False
>=	Greater than or equal to	5>=3	True
Logical operator	!	Logical non	! True	False
&	Logic and	True & False	False
|	Logical OR	True | False	True
^	Logical XOR or	True ^ False	True