Java Script Lecture 5

1
Java Script Lecture 5

• -- last assignment (use free late)
• -- this weeks assignment
• -- review chapter 18
• -- functions

2
Function Packages for algorithms

• Name
• Parameters
• Definition
• Also known as,
• procedures, subroutine, method etc

3

• function name (parameter list)
• statement list

4

• function print ()
• document.write(hello)

5

• lthtmlgt
• ltheadgt
• ltscript type"text/javascript"gt
• function hello()
• document.write("ltbrgt hello")
• document.write ("outside the function")
• hello()
• lt/scriptgt
• lt/headgt
• ltbodygtlt/bodygt
• lt/htmlgt

6
lthtmlgt ltheadgt ltscript type"text/javascript"gt
function displaymessage() alert("This
appears only when the function is
called") alert("this shall appear
anyways") lt/scriptgt lt/headgt
ltbodygt ltscript
type"text/javascript"gt
displaymessage() lt/scriptgt
lt/bodygt lt/htmlgt
7

• lthtmlgt
• ltheadgt
• ltscript type"text/javascript"gt
• var text1 hello inside function
• var text2 hello outside function
• function passarg(text1)
• alert(text1)
• alert(text2)
• lt/scriptgt
• lt/headgt
• ltbodygtlt/bodygt
• lt/htmlgt

8

• lthtmlgt
• ltheadgtlttitlegtfunction addlt/titlegt
• ltscript type"text/javascript"gt
• function add(a,b)
• c ab
• return c
• alert("this shall appear anyways")
• add()
• ltbodygt lt/bodygt
• lt/htmlgt