【JavaScript Tutorial】JavaScript Operators

JavaScript Operator

Operator = is used for assignment.

Operator + is used to add value.

Operator = is used to assign values ​​to JavaScript variables.

The arithmetic operator + is used to add values ​​together.

Example

Specify variable values ​​and add the values:

y=5;
z=2;
x=y+z;

After the above statement is executed, the value of Arithmetic operations between values. =""

Operator

Description

Example

x Operation Result

y Operation Result

Online examples

+ Addition x=y+2 7 5 Examples»

- Subtraction x=y-2 3 5 Examples»

* Multiplication x=y* 2 10 5 Example»

/ Division x= y/2 2.5 5 Example»

% Modulo (remainder) x=y%2 1 5 Example»

++ Auto-increment x=++y 6 6 Example»

x=y++ 5 6 Example»

-- Decrement x=--y 4 4 Example»

x=y-- 5 4 Example»

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 operator:

operator

example

is equivalent to

operation result

online example

= x =y x=5 Example»

+= x+=y x=x+y x=15 Example»

-= x-=y x=x-y x=5 Example» *=y x= x*y x=50 Example»

/= x/=y x=x/y x=2 Example»

%= x%=y x=x%y x=0 Example»

for strings The + operator

The + operator is used to add (concatenate) text values ​​or string variables.

If you need to connect two or more string variables, please use the + operator.

Example

If you need to connect two or more string variables, please use the + operator:

7

txt3 The operation result is as follows:

txt1="What a very";
txt2="nice day";
txt3=txt1+txt2;

If you want to add a space between two strings, you need to Insert spaces into a string:

Example

What a verynice day

After the above statement is executed, the value contained in variable txt3 is:

txt1="What a very ";
txt2="nice day";
txt3=txt1+txt2;

Or insert spaces into the expression::

Example

What a very nice day

After the above statement is executed , the value contained in the variable txt3 is:

txt1="What a very";
txt2="nice day";
txt3=txt1+" "+txt2;

Add strings and numbers

Add two numbers and return the sum of the added numbers. If a number is added to a string, a string is returned, as shown in the following example:

Example

What a very nice day

x, y, and z output results are:

10
55
Hello5

规则:如果把数字与字符串相加，结果将成为字符串！

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