Precedence of operators in JavaScript

Operator Precedence
Operator precedence in JavaScript is a set of rules. This rule controls the order in which operators execute when evaluating expressions. Operations with higher precedence are performed Mr. Foo the operators of lower precedence. For example, multiplication is performed prior to addition.

The following table lists the JavaScript operators by priority from highest to lowest. Operators with the same precedence are evaluated in order from left to right.

Summary tableEDIT

The following table arranges all operators from highest to lowest in priority order.

Priority Level	type of Operation	Relevance of	operator
20	圆括号	N/A	( … )
19	成员访问	From left to right	… . …
	需计算的成员访问	From left to right	… [ … ]
	new(with parameter list)	N/A	new … ( … )
18	Function call	From left to right	… ( … )
	New (no parameter list)	From right to left	new …
17	Post increment (operator behind)	N/A	… ++
	Post decrement (operator behind)	N/A	… --
16	Logical Non-	From right to left	! …
	Bitwise non-	From right to left	~ …
	One-dollar addition	From right to left	+ …
	One-dollar subtraction	From right to left	- …
	Forward increment	From right to left	++ …
	Forward Decrement	From right to left	-- …
	typeof	From right to left	typeof …
	void	From right to left	void …
	Delete	From right to left	delete …
15	Power	From right to left	… ** …
14	Multiplication	From left to right	… * …
	Division	From left to right	… / …
	Take the mold	From left to right	… % …
13	Addition	From left to right	… + …
	Subtraction	From left to right	… - …
12	Bitwise LEFT Shift	From left to right	… << …
	Bitwise RIGHT SHIFT	From left to right	… >> …
	Unsigned Right Shift	From left to right	… >>> …
11	Less than	From left to right	… < …
	Less than or equal	From left to right	… <= …
	Greater than	From left to right	… > …
	Greater than or equal	From left to right	… >= …
	Inch	From left to right	… in …
	instanceof	From left to right	… instanceof …
10	Equals	From left to right	… == …
	Non-equal sign	From left to right	… != …
	Full equals	From left to right	… === …
	Non-full equals	From left to right	… !== …
9	Bitwise-AND	From left to right	… & …
8	Bitwise XOR OR	From left to right	… ^ …
7	Bitwise OR	From left to right	… | …
6	Logic and	From left to right	… && …
5	Logical OR	From left to right	… || …
4	Conditional operators	From right to left	… ? … : …
3	Assign value	From right to left	… = …
			… += …
			… -= …
			… *= …
			… /= …
			… %= …
			… <<= …
			… >>= …
			… >>>= …
			… &= …
			… ^= …
			… |= …
2	Yield	From right to left	yield …
	yield*	From right to left	yield* …
1	Expand operator	N/A	......
0	Comma	From left to right	… , …

Operator	Describe
. [] ()	field access, array subscripts, function calls, and expression grouping
++ -- - ~ ! Delete new typeof void	Unary operators, return data types, object creation, undefined values
* / %	Multiplication, division, modulo
+ - +	addition, subtraction, string connection
<< >> >>>	Shift
< <= > >= instanceof	Less than, equal to, greater than, greater than or equal to, instanceof
== != === !==	Equal, not equal, strictly equal, not strictly equal
&	Bitwise-AND
^	Bitwise XOR OR
|	Bitwise OR
&&	Logic and
||	Logical OR
?:	Conditions
= op=	Assignment, Operation assignment
,	Multi-value evaluation

Parentheses can be used to change the order of evaluation determined by the operator precedence. This means that the expression in parentheses should be evaluated all before it is used for the remainder of the expression.

z = * (3 + +)

There are five operators in the expression: =, *, (), +, and another +. Based on the rules for operator precedence, they are evaluated in the following order: (), +, +, *, =.

The expression in parentheses is evaluated first. There are two addition operators in the parentheses. Because two addition operators have the same precedence, they are evaluated from left to right. Add 96 and 3 first, then add it and add it to 45, resulting in 144.
Then the multiplication operation. 78 times 144 to get the result 11232.
A finally an assignment operation. Assign 11232 to Z.

Precedence of operators in JavaScript