- Inside the < head> tag
- Inside the < body> tag
- In an external file
To invoke a function, you must first work on an event. The onclick event is used to invoke the msg() function.
< form> < input type=”button” value=”click” onclick=”msg()”/> < /form> < /body> < /html>
The file must be saved with the .js extension.
- Fixed values
- Variable values
The fixed values are known as Literals, whereas the changeable values are known as Variables.
During addition and concatenation, we utilized the assignment operator = as well as the arithmetic operator + in the preceding code (joining the strings together).
These are the values, operations, and variables combined. They are utilized to determine the value.
sum = operand1 + operand2; is the expression used in the code.
They are used to identify variables in a script. They adhere to the following guidelines:
- Identifiers must begin with a letter, a dollar symbol ($), or a dash ( ).
- Identifiers can only contain letters, numbers, the dollar symbol ($), and the underscore ( ).
- A keyword cannot be an identification.