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Question: How do I ... with JavaScript/JScript ... use the same variable name several times in a script?
Answer: By default all variables in JavaScript are global, meaning they retain their values everywhere in a scripted web page. To make a variable local to a block (such as a function), declare it with the keyword var. Here's a n example:
// here 'i' is a global counter variable that could, if reused // elsewhere in this script, create hard-to-find errors
for( i=1; i<=N; i++ ) { [code to iterate] }
// to ensure that 'i' exists only in the scope of this // counter, use var:
for( var i=1; i<=N; i++ ) { [ ... ] }
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Java Script Interview Questions & Answers -
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10/6/2012 4:50:23 AM |
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Question:
How do I ... with JavaScript/JScript ... use the same variable name several times in a script?
Answer:
By default all variables in JavaScript are global, meaning they retain their values everywhere in a scripted web page. To make a variable local to a block (such as a function), declare it with the keyword var. Here's a n example:
// here 'i' is a global counter variable that could, if reused // elsewhere in this script, create hard-to-find errors
for( i=1; i<=N; i++ ) { [code to iterate] }
// to ensure that 'i' exists only in the scope of this // counter, use var:
for( var i=1; i<=N; i++ ) { [ ... ] } Source: CoolInterview.com
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