JavaScript Operators
= is used to assign values.
+ is used to add values.
The assignment operator = is used to assign values to JavaScript variables.
The arithmetic operator + is used to add values together.
The value of x, after the execution of the statements above is 7.
JavaScript Arithmetic Operators
Arithmetic operators are used to perform arithmetic between variables and/or values.
Given that y=5, the table below explains the arithmetic operators:
| Operator |
Description |
Example |
Result |
| + |
Addition |
x=y+2 |
x=7 |
| - |
Subtraction |
x=y-2 |
x=3 |
| * |
Multiplication |
x=y*2 |
x=10 |
| / |
Division |
x=y/2 |
x=2.5 |
| % |
Modulus (division remainder) |
x=y%2 |
x=1 |
| ++ |
Increment |
x=++y |
x=6 |
| -- |
Decrement |
x=--y |
x=4 |
JavaScript Assignment Operators
Assignment operators are used to assign values to JavaScript variables.
Given that x=10 and y=5, the table below explains the assignment operators:
| Operator |
Example |
Same As |
Result |
| = |
x=y |
|
x=5 |
| += |
x+=y |
x=x+y |
x=15 |
| -= |
x-=y |
x=x-y |
x=5 |
| *= |
x*=y |
x=x*y |
x=50 |
| /= |
x/=y |
x=x/y |
x=2 |
| %= |
x%=y |
x=x%y |
x=0 |
The + Operator Used on Strings
The + operator can also be used to add string variables or text values together.
To add two or more string variables together, use the + operator.
txt1="What a very";
txt2="nice day";
txt3=txt1+txt2; |
After the execution of the statements above, the variable txt3 contains "What a verynice day".
To add a space between the two strings, insert a space into one of the strings:
txt1="What a very ";
txt2="nice day";
txt3=txt1+txt2; |
or insert a space into the expression:
txt1="What a very";
txt2="nice day";
txt3=txt1+" "+txt2; |
After the execution of the statements above, the variable txt3 contains:
"What a very nice day"
Adding Strings and Numbers
The rule is: If you add a number and a string, the result will be a string!
Example
x=5+5;
document.write(x);
x="5"+"5";
document.write(x);
x=5+"5";
document.write(x);
x="5"+5;
document.write(x);
|
Try it yourself »
|
Create a free Flash website with our simple, online web design editing platform. Stunning templates
and user-friendly tools make website building easy and fun.
Start Creating your free website now!
The Altova MissionKit is an integrated suite of tools ideal for:
- XML development
- Web & Web services development
- Data mapping & integration
- Rendering & publishing XML & database data
- XBRL validation, taxonomy editing, transformation & rendering
The MissionKit for XML Developers includes XMLSpy® - the industry-leading XML editor; MapForce® - a
graphical data mapping, conversion, and integration tool; StyleVision® - a visual XSLT stylesheet designer;
DiffDog® - an XML-aware diff/merge tool; and 2 additional tools.
Try all 6 products free for 30 days!
Download a fully-functional free trial
|
|
|
| 
