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<!DOCTYPE html>
<html>
<body>
​
<p>A function can access variables defined outside the function:</p>
​
<button type="button" onclick="myFunction()">Click Me!</button>
​
<p id="demo"></p>
​
<script>
var a = 4;
function myFunction() {
  document.getElementById("demo").innerHTML = a * a;
} 
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=tryjs_function_scope1 by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:39:36 GMT -->
</html>
​
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