how to find total height of single page page in html

1function calculateTotalHeightMinusElement(excludeElementClass)
2{
3  // Get all child elements of the body tag
4  var bodyChildren = (document.getElementsByTagName('body')[0]).children;
5
6  var totalHeight = 0;
7
8  // Loop through the selected elements
9  for (var i = 0; i < bodyChildren.length; i++) {
10
11    // Add the height of this element
12    totalHeight = totalHeight + bodyChildren[i].offsetHeight;
13  }
14
15  // Get the height of the element we want to exclude
16  var excludedElementHeight = document.getElementsByClassName(excludeElementClass)[0].offsetHeight;
17
18  // Calculate height minus the excluded element
19  var finalHeight = totalHeight - excludedElementHeight;
20
21  // Display the final height in an alert
22  alert("Total height: " + finalHeight);
23}
24
25document.addEventListener("DOMContentLoaded", function(event) {
26
27  // Pass in the class name of the element you want to minus from the height calculation
28  calculateTotalHeightMinusElement("myDivClass");
29});
30