Javascript&jquery. Expressions and operators

Expressions and operators

An expression

An expression can ask for a value, and the evaluation can contain an operation.

varlength=80

Two or more values can be used in an expression, and the expression eventually returns a value. If you ask for the area of the table.

var area=80*60

Operator

An operator is required in the expression, which operates on one or more values and gets a value.

Commonly used operators are: assignment operators, comparison operators, arithmetic operators, logical operators, string operators.

Arithmetic operators

Arithmetic operators are similar to mathematics, and are used very much in numerical calculations.

Add + adds a value and another value

Subtraction-Subtracts one value from another

Divide/Divide two values

Multiply * multiply two values by using an asterisk (*)

Increment + + Current value plus one

Decrement--current value minus one

Modulo% two values divide, return remainder

String operator

There is only one string operator (+) that is used to concatenate strings sequentially.

var strA= "Hello" ; var strB= "JavaScript" ; var strC=strA+strB; document.write(strC);strings can not only concatenate strings, they can also concatenate numbers, and numbers are used when strings are concatenated. var strA= "Hello " ; var strB=368; var strC=strA+strB; document.write(strC);

Javascript&jquery. Expressions and operators