You can define the variable in a function and pass it to the callback function in JavaScript. The callback function should have a parameter option.
Access to a variable outside of a callback function in javascript
HTML example code:-
<html>
<body>
<script>
function displayResult(res) {
console.log(res)
}
function addNum(num1, num2, myCallback) {
var sum;
sum = num1 + num2;
myCallback(sum);
}
// Test case
addNum(10, 5, displayResult);
</script>
</body>
</html>Output:
Do comment if you have any doubts and suggestion on this JS variable topic.
Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version
this does not help a single bit
Can’t more agree