There are 2 types of variables in JavaScript.
A variable which is declared inside block or function is called local variable. It is accessible within the function or block only.
var a=5;//gloabal variable
function mahi()
{
document.write(a);
}
function piyu()
{
var b=10;//local variable
document.write(a);
document.write(b);
}
</script>
1) Local Variable
A variable which is declared inside block or function is called local variable. It is accessible within the function or block only.
Ex:-
<html>
<body>
<script>
function mahi()
{
var a=5;//local variable
}
</script>
</body>
</html>
<body>
<script>
function mahi()
{
var a=5;//local variable
}
</script>
</body>
</html>
2) Global Variable
A variable which declared outside the function or with window object is known as global variable. It is accessible from any function.
Ex:-
<script> var a=5;//gloabal variable
function mahi()
{
document.write(a);
}
function piyu()
{
var b=10;//local variable
document.write(a);
document.write(b);
}
</script>
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