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Jabarikh
New member
Joined: 19 Sep 2012
Posts: 1
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 Posted: Wed Sep 19, 2012 8:54 am Post subject: What is the difference between Global and Local Variables? |
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| What is the difference from a functional stand point and is there any overlap in their capabilities? |
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sohnee
Senior Member
Joined: 17 Jul 2002
Posts: 2077
Location: UK
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| Posted: Thu Oct 11, 2012 2:41 am Post subject: |
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Here is an example.
| Code: |
var myVar = 1; // global
function myFunction () {
var myVar = 2; // local
alert(myVar); // 2
}
function myOtherFunction() {
alert(myVar); // 1
}
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Where possible, you should avoid global variables.
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phil karras
Senior Member
Joined: 15 Jul 2002
Posts: 1776
Location: MD
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| Posted: Tue Oct 16, 2012 7:31 am Post subject: |
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| Quote: | | What is the difference from a functional stand point and is there |
The difference is that a global var can be used within any function created in the html file or in the js file(s) called into the html file.
A local var can only be used within the function it is created in.
Overlap: Yes & no, yes: a global can be used as if it were a local, but this is not advised, and no: a local can not be used as a global.
sohnee has said it all, | Quote: | | Where possible, you should avoid global variables. |
This is because a global can really mess things up if one is not very careful to only use it as intended. A global should be used ONLY if there is no other way to do the job.
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