Summury

The introduction in JAVAScript

• ** A Script : is a series of instructions that a computer can follow one by one .**

• The comment is to explain what the code does .

• ** Variable : place to store data temporilly .**

• ** Before use a variable , you need to announce that you want to use it .**

• JavaScript make your web page more interactive by accessing and modifing content .

• JAVASCRIPT IS CASE SENSITIVE JavaScript is case sensitive so hourNow means something different to HourNow or HOURNOW.

EXAMPLES OF JAVASCRIPT IN THE BROWSER

Being able to change the content of an HTML page while it is loaded in the browser is very powerful. The examples below rely on the ability to:

Access the content of the page Modify the content of the page Program rules or instructions the browser can follow React to events triggered by the user or browser .

HTML & CSS A QUICK REFRESHER

CSS : Uses rules to indicate how the content of one or more element should be displayed in the browser .

OPERATORS

Expressions rely on things called operators; they allow programmers to create a single value from one or more values.

*JavaScript contains the following mathematical operators, which you can use with numbers. You may remember some from math class.

STRING OPERATOR

There is just one string operator: the+ symbol. It is used to join the strings on either side of it.

WHAT IS A FUNCTION?

Functions let you group a series of statements together to perform a specific task. If different parts of a script repeat the same task, you can reuse the function (rather than repeating the same set of st atements).