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<!DOCTYPE html>
<html>
<body>
​
<h2>JavaScript Function Closures</h2>
​
<p>Counting with a local variable.</p>
​
<p id="demo"></p>
​
<script>
// Initiate counter
var counter = 0;
​
// Function to increment counter
function add() {
  var counter = 0; 
  counter += 1;
}
​
// Call add() 3 times
add();
add();
add();
​
// The result is not 3 because you mix up the globaland local counter
document.getElementById("demo").innerHTML = "The counter is: " + counter;
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=tryjs_function_closures2 by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:39:36 GMT -->
</html>
​
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