Hướng dẫn javascript subtraction not working

Question

I am trying to work on subtracting 2 values in Javascript. I had the addition working and then I just copied the code for subtraction (I just changed the operator). But I am wondering why the subtraction is not working. Can you please tell me what did I miss?

Nội dung chính Show

Using subtraction assignment
Specifications
Browser compatibility
JavaScript Arithmetic Operators
Arithmetic Operations
Operators and Operands
Subtracting
Multiplying
Incrementing
Decrementing
Exponentiation
Operator Precedence
JavaScript Operator Precedence Values
Test Yourself With Exercises
How do you subtract in node JS?
How do you subtract two numbers in typescript?

Here's the code:

And then in the html part:

Thanks.

asked Feb 26, 2014 at 11:43

Hướng dẫn javascript subtraction not working

The problem is that:

Does not have an id attribute specified. Without id, document.getElementById('net'); fails.

Change it to:

And ded is an object, you need to use .value for both ded and net variables.

answered Feb 26, 2014 at 11:45

AashrayAashray

2,71515 silver badges22 bronze badges

0

becomes

and

net.value = gross - ded;

becomes

net.value = gross - ded.value;

answered Feb 26, 2014 at 11:47

The subtraction assignment operator (-=) subtracts the value of the right operand from a variable and assigns the result to the variable.

Nội dung chính

Using subtraction assignment
Specifications
Browser compatibility
JavaScript Arithmetic Operators
Arithmetic Operations
Operators and Operands
Subtracting
Multiplying
Incrementing
Decrementing
Exponentiation
Operator Precedence
JavaScript Operator Precedence Values
Test Yourself With Exercises
How do you subtract in node JS?
How do you subtract two numbers in typescript?

Try it

Syntax

Examples

Using subtraction assignment

// Assuming the following variable
//  bar = 5

bar -= 2     // 3
bar -= 'foo' // NaN

Specifications

Specification
ECMAScript Language Specification # sec-assignment-operators

Browser compatibility

BCD tables only load in the browser

JavaScript Arithmetic Operators

Arithmetic operators perform arithmetic on numbers (literals or variables).

Operator	Description
+	Addition
-	Subtraction
*	Multiplication
**	Exponentiation (ES2016)
/	Division
%	Modulus (Remainder)
++	Increment
--	Decrement

Arithmetic Operations

A typical arithmetic operation operates on two numbers.

The two numbers can be literals:

or variables:

or expressions:

Operators and Operands

The numbers (in an arithmetic operation) are called operands.

The operation (to be performed between the two operands) is defined by an operator.

Operand	Operator	Operand
100	+	50

Adding

The addition operator (+) adds numbers:

Subtracting

The subtraction operator (-) subtracts numbers.

Multiplying

The multiplication operator (*) multiplies numbers.

Dividing

The division operator (/) divides numbers.

Remainder

The modulus operator (%) returns the division remainder.

In arithmetic, the division of two integers produces a quotient and a remainder.

In mathematics, the result of a modulo operation is the remainder of an arithmetic division.

Incrementing

The increment operator (++) increments numbers.

Decrementing

The decrement operator (--) decrements numbers.

Exponentiation

The exponentiation operator (**) raises the first operand to the power of the second operand.

x ** y produces the same result as Math.pow(x,y):

Operator Precedence

Operator precedence describes the order in which operations are performed in an arithmetic expression.

Is the result of example above the same as 150 * 3, or is it the same as 100 + 150?

Is the addition or the multiplication done first?

As in traditional school mathematics, the multiplication is done first.

Multiplication (*) and division (/) have higher precedence than addition (+) and subtraction (-).

And (as in school mathematics) the precedence can be changed by using parentheses:

When using parentheses, the operations inside the parentheses are computed first.

When many operations have the same precedence (like addition and subtraction), they are computed from left to right:

JavaScript Operator Precedence Values

Pale red entries indicates ECMAScript 2015 (ES6) or higher.

Value	Operator	Description	Example
21	( )	Expression grouping	(3 + 4)

20	.	Member	person.name
20	[]	Member	person["name"]
20	()	Function call	myFunction()
20	new	Create	new Date()

18	++	Postfix Increment	i++
18	--	Postfix Decrement	i--

17	++	Prefix Increment	++i
17	--	Prefix Decrement	--i
17	!	Logical not	!(x==y)
17	typeof	Type	typeof x

16	**	Exponentiation (ES2016)	10 ** 2

15	*	Multiplication	10 * 5
15	/	Division	10 / 5
15	%	Division Remainder	10 % 5

14	+	Addition	10 + 5
14	-	Subtraction	10 - 5

13	<<	Shift left	x << 2
13	>>	Shift right	x >> 2
13	>>>	Shift right (unsigned)	x >>> 2

12	<	Less than	x < y
12	<=	Less than or equal	x <= y
12	>	Greater than	x > y
12	>=	Greater than or equal	x >= y
12	in	Property in Object	"PI" in Math
12	instanceof	Instance of Object	instanceof Array

11	==	Equal	x == y
11	===	Strict equal	x === y
11	!=	Unequal	x != y
11	!==	Strict unequal	x !== y

10	&	Bitwise AND	x & y
9	^	Bitwise XOR	x ^ y
8	\|	Bitwise OR	x \| y
7	&&	Logical AND	x && y
6	\|\|	Logical OR	x \|\| y
5	??	Nullish Coalescing	x ?? y
4	? :	Condition	? "Yes" : "No"

3	+=	Assignment	x += y
3	/=	Assignment	x /= y
3	-=	Assignment	x -= y
3	*=	Assignment	x *= y
3	%=	Assignment	x %= y
3	<<=	Assignment	x <<= y
3	>>=	Assignment	x >>= y
3	>>>=	Assignment	x >>>= y
3	&=	Assignment	x &= y
3	^=	Assignment	x ^= y
3	\|=	Assignment	x \|= y

2	yield	Pause Function	yield x
1	,	Comma	5 , 6

Expressions in parentheses are fully computed before the value is used in the rest of the expression.

Test Yourself With Exercises

Is there a

The subtraction assignment operator ( -= ) subtracts the value of the right operand from a variable and assigns the result to the variable.

How do you subtract in node JS?

subtract() method is used to subtract the two date objects..

Required Module: Install the module by npm or used it locally. ... .

Syntax: const subtract(date1, date2).

Parameters: This method takes the following arguments as a parameter:.

Example 1: ... .

Output: total days between them 2270.3951833333335..

Example 2:.

How do you subtract two numbers in typescript?

Arithmetic Operators in Typescript.

+ (Addition).

– (Subtraction).

* (Multiplication).

/ (Division).

% (modulus or Reminder).

++ (Increment) & — (Decrement).

+ & – (Unary plus & Unary minus).

** (Exponentiation operator).

programming javascript Subtract JavaScript JavaScript math problems String subtraction JavaScript JavaScript parseFloat minus Js minus number TypeScript subtract

Hướng dẫn javascript subtraction not working

Try it

Syntax

Examples

Using subtraction assignment

Specifications

Browser compatibility

See also

JavaScript Arithmetic Operators

Arithmetic Operations

Operators and Operands

Adding

Subtracting

Multiplying

Dividing

Remainder

Incrementing

Decrementing

Exponentiation

Operator Precedence

JavaScript Operator Precedence Values

Test Yourself With Exercises

Is there a

How do you subtract in node JS?

How do you subtract two numbers in typescript?

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