JavaScript Enhancement Tutorial - JavaScript Operators

This article is the official HTML5 training tutorial of H5EDU organization. It mainly introduces: JavaScript intensive tutorial - JavaScript operators
JavaScript arithmetic operators

Arithmetic operators are used to perform operations on two variables or values.

Assign y = 5, the following table will explain to you the use of arithmetic operators:

Operator Description Example y Value x Value Online Example
+ Addition x = y + 2 y = 5 x = 7 Example »
- Subtraction x = y - 2 y = 5 x = 3 Example »
* Multiplication x = y * 2 y = 5 x = 10 Example »
/ Division x = y / 2 y = 5 x = 2.5 Example »
% Remainder x = y % ​​2 y = 5 x = 1 Example »
++ Increment x = ++y y = 6 x = 6 Example »
x = y++ y = 6 x = 5 Example »
-- Decrement x = --y y = 4 x = 4 Example»
x = y-- y = 4 x = 5 Example»

For arithmetic operators, you can read our JavaScript operators tutorial.

JavaScript assignment operator

The assignment operator is used to assign values ​​to JavaScript variables.

Given x=10 and y=5, the following table explains the assignment operators:

Operator Example Same As x Value Online Example
= x = y x = y x = 5 Example »
+= x += y x = x + y x = 15 Example»
-= x -= y x = x - y x = 5 Example»
*= x *= y x = x * y x = 50 Example»
/= x /= y x = x / y x = 2 Examples»
%= x %= y x = x % y x = 0 Examples»

For assignment operators, you can read our JavaScript operators tutorial.

JavaScript String Operators

+ operator, += operator can be used to concatenate strings.

Given text1 = "Good ", text2 = "Morning", and text3 = "", the following table explains the use of string operators:

Operator Example text1 text2 text3 Online Example
+ text3 = text1 + text2 "Good " "Morning" "Good Morning" Example »
+= text1 += text2 "Good Morning" "Morning" "" Example »
Comparison operator

Comparison operator is used to judge logical statements to determine the given Whether two specified values ​​or variables are equal.

Given x=5, the following table shows the use of comparison operators:

Operator Description Comparison Result Online Example
== Equal to x == 8 false Example »
x == 5 true Example »
=== Values ​​and types are equal (equal to) x === "5" false Example »
x === 5 true Example »
!= Not equal to x != 8 true Example »
!== Values ​​and types are not equal (not identical) x !== "5" true instance »
x !== 5 false instance »
> greater than x > 8 false instance »
< less than x < 8 true instance »
>= Greater than or equal to x >= 8 false Example »
<= Less than or equal to x <= 8 true Example »

For comparison operators, you can read our JavaScript comparison operators tutorial.

Conditional operator

Conditional operator is used for assignment operations based on conditions.

Given x=6 and y=3, the following table demonstrates the operation of the conditional operator:

Syntax example online example
Variable = (condition) ? value 1: value 2 voteable = (age & 18) ? "Too young" : "Old enough" Example »
Logical operators

Logical operators are used to determine the logical relationship between variables or values.

Given x=6 and y=3, the following example demonstrates the use of logical operators:

Operator Description Example
&& and (x < 10 && y > 1) are true
|| or (x == 5 || y == 5) is false
! Not!(x == y) is true
JavaScript Bit Operators

Bit operators work on 32-bit numbers. Any numeric operations will be converted to 32 bits. The result is converted to a JavaScript number.
Operator description example is similar to the result decimal
& AND x = 5 & 1 0101 & 0001 0001 1
| OR x = 5 | 1 0101 | 0001 0101 5
~ Negate Or x = 5 ^ 1 0101 ^ 0001 0100 4
<< Shift left/td> ; 1 0101 >> 1 0010 2