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java script is a light weight programming language that can be inserted into HTML pages and can be
executed by all modern web pages
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it is object based language but does not support inheritence and is case sensitive
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e
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and it is not related with java
java scripts can be put inside the and the section of an HTML page
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write("hello world!");
PROGRAM 2
JAVASCRIPT COMMENTScomments can be added to explain the javascript or to make the code more readable
1
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javascript multiline comments /*
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you declare javascript variables with the var keyword
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- var x;
var x=5;
var x="volvo";
PROGRAM 4
RULES FOR JAVASCRIPT VARIABLES-
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no spaces
3
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commas, fullstop)
4
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5
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TYPES OF VARIABLE1
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a javascript function becomes LOCAL and can be only accessed within
you can have local variables with the same name in different functions, because the local
variables are only recognised by the function in which they are declared
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2
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global variables are destroyed when you close the page
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ASSIGNING VALUES TO UNDECLARED JAVASCRIPT VARIABLESif you assign values to variables that have not yet been declared , the variables will automatically
be declared as global variables