HOW HTML, CSS, & JAVASCRIPT FIT TOGETHER
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Progressive Enhancement
1- HTML only 2- HTML + CSS 3- HTML + CSS + JavaScript
Creating a Basic JavaScript
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Code below is a basic JavaScript
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Linking to a javascript file from an HTML page in this html tag
*
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The best palce to put scripts in their own files is the end of the body
- A script is a series of instructions that a computer can follow one-by-one. Each individual instruction or step is known as a statement.
- Statements should end with a semicolon.
- writting comments to explain what your code does.They help make your code easier to read and understand. This can help you and others who read your code.
- Tow ways to write comment
- 1- // for single line
- 2- / / for multi line
- Tow ways to write comment
- A script will have to temporarily store the bits of information it needs to do its job. It can store this data in variables.
- A variable is a good name for this concept because the data stored in a variable can change (or vary) each time a script runs
- The variable decleration is as this var x;
- The variable Assigning is as this x=3;
-JavaScript distinguishes between numbers,strings, and true or false values known as Booleans.
- 3 is a number
- ‘Ahmed’ is a strings
- Boolean is a true or false
- A variable name in JavaScript
- 1- must be started with a letter.
- 2- can contain letters,numbers, dollar sign ($), or an underscore (_). Note that you must not use a dash(-) or a period (.) in a variable name.
- 3- should not be keyWord such as if
- 4-is the case sensetive: so score and Score would be different variable names, but it is bad practice to create two variables that have the same name using different cases.