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Function are subprograms which are used to compute a value or perform a task.
Type of Function
– Library or Built-in functions Ex: – valueOf( ) , write( ), alert( ) etc
– User-defined functions
Example
| function display( ) | |
| { | |
| document.write(“DevOpsSchool”); | |
| } |
by Rules
- Function name only starts with a letter, an underscore ( _ ).
- Function name cannot start with a number.
- Do not use reserved keywords. e.g. else, if etc.
- Function names are case-sensitive in JavaScript.
How Function Call Works
The code inside a function isn‟t executed until that function is called.
| document.write (“First Line <br />”); | |
| display( ); | |
| document.write(“DevOpsSchool”); | |
| function display( ) | |
| { | |
| document.write(“Welcome to DevOpsSchool <br />”); | |
| } | |
| document.write(“Last Line <br />”); |
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