What are the operators of javascript

Operator, also known as "operator", is a symbol used to tell the JavaScript engine to perform a certain operation. For example, the plus sign " " means to perform addition operations, and the minus sign "-" means to perform subtraction operations, etc. JavaScript operators include arithmetic operators, bitwise operators, assignment operators, comparison operators, etc.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

javascript Operator

Operator, also known as "operator", is a symbol used to tell the JavaScript engine to perform a certain operation. For example, the plus sign " " means execution Addition operation, the minus sign "-" means performing subtraction operation, etc.

JavaScript operators apply to many values, such as strings, numeric values, Boolean values, and even objects. When applied to an object, the corresponding operator will call the object's valueOf() and/or toString() methods to obtain the operable value.

Arithmetic operators

Arithmetic operators are used to perform common mathematical operations, such as addition, subtraction, multiplication, division, etc. The following table lists the support in JavaScript Arithmetic operators:

##Addition operatorx y means calculating the sum of x plus y##-*/%

Operator	Description	Example
Subtraction operator	x - y means to calculate the difference of x minus y
Multiplication operator	x * y means to calculate the product of x times y
Division operator	x / y means calculating the quotient of x divided by y
Modulo (remainder) operator	x % y means calculating the remainder of x divided by y

Assignment operation The

assignment operator is used to assign values ​​to variables. The following table lists the assignment operators supported in JavaScript:

Operator=Comparison operator is used to compare the expressions on the left and right sides of the operator. The result of the comparison operator is a Boolean value. There are only two results, either true or false. . The comparison operators supported in JavaScript are listed in the following table:

Description	Example
The simplest assignment operator, assigns the value on the right side of the operator Giving the variable	x = 10 to the left side of the operator means assigning the variable Assigning a value to the variable on the left side of the operator	x = y is equivalent to x = x y
-=	First perform the subtraction operation, and then add the result Assigning a value to the variable on the left side of the operator	x -= y is equivalent to x = x - y
*=	. Perform multiplication first, Then assign the result to the variable on the left side of the operator	x *= y is equivalent to x = x * y
/=	Proceed first Division operation, and then assign the result to the variable on the left side of the operator	x /= y is equivalent to x = x / y
%=	First perform the modulo operation, and then assign the result to the variable on the left side of the operator	x %= y is equivalent to x = x % y
	Comparison operator

Operator

Name

Example##>=greater than or equalx >= y means if x is greater than or equal to y, then true <=less than or equal tox <= y means if x is less than or equal to y, then Is trueLogical operators

==	equals	x == y means true if x equals y
===	Congruent	x === y means true if x is equal to y, and x and y are also of the same type
!=	Not equal	x != y means if x is not equal to y, it is true
!==	Incomplete etc	x !== y means it is true if x is not equal to y, or if x and y have different types
<	less than	x < y means true if x is less than y
>	greater than	x > y means true if x is greater than y
		Logical operators are usually used to combine multiple expressions, and the results of logical operators It is a Boolean value and can only have two results, either true or false. The following table lists the logical operators supported in JavaScript:

OperatorName

Example

&&Logical ANDx && y means if both x and y are true, then it is true|| Logical ORx || y means if either x or y is true, then it is true! Logical negation!x means if x is not true, then it is true

Bit operators

Bit operators are used to operate on binary bits. The bit operators supported in JavaScript are as shown in the following table:

Operator	Description	Example
&	Bitwise AND: If the corresponding binary bit Both are 1, then the binary digit is 1	5 & 1, which is equivalent to 0101 & 0001. The result is 0001, and the decimal result is 1
|	Bitwise OR: If one of the corresponding binary bits is 1, then the binary bit is 1	5 | 1 is equivalent to 0101 | 0001. The result is 0101, and the decimal result is 5
^	Bitwise XOR: If only one of the corresponding binary bits is 1, then the binary bit is 1	5 ^ 1 is equivalent to 0101 ^ 0001 and the result is 0100 , the decimal result is 4
~	Bitwise NOT: Invert all binary bits, that is, 1 is converted to 0, 0 is converted to 1	~5 is equivalent to ~0101, the result is 1010, the decimal result is -6
<<	Bitwise left shift: Move all binary bits uniformly to the left The specified number of digits, and 0	5 << 1 is equivalent to 0101 << 1. The result is 1010, and the decimal result is 10
>>	Bitwise right shift (signed right shift): Move all binary bits uniformly to the right by the specified number of bits, and copy the leftmost bit to fill the left side	5 >> 1 is equivalent to 0101 >> 1 The result is 0010, the decimal result is 2
>>>	Press Bit right shift by zero (unsigned right shift): Shift all binary bits to the right by the specified number of bits, and add 0 to the far left	5 >>> 1 is equivalent to 0101 > >> The result of 1 is 0010, and the decimal result is 2

Increase and decrement operators

Increase and The auto-decrement operator is used to perform auto-increment (1) and auto-decrement (-1) operations on the value of a variable. The following table lists the auto-increment and auto-decrement operators supported in JavaScript:

Operator	Name	Affect
x	Increment operator	Add 1 to x, and then return the value of x
x	Increment operator	Return the value of x, and then add x 1
--x	Decrement operator	Decrease x by 1 and then return the value of x
x--	Decrement operator	Returns the value of x, then decrements x by 1

Ternary operator

The ternary operator (also known as the conditional operator) consists of a question mark and a colon. The syntax format is as follows:

条件表达式 ? 表达式1 : 表达式2 ;

If "conditional expression If the result of "expression" is true (true), then the code in "expression 1" will be executed, otherwise the code in "expression 2" will be executed.

Explanation: String operations

The and = operators in JavaScript can not only perform mathematical operations, but also Can be used to splice strings, where:

• The operator means splicing the strings on the left and right sides of the operator together;

• The = operator means to concatenate strings first, and then assign the result to the variable on the left side of the operator.

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