function which execute when site is loaded in javascript

To execute a function when a site is loaded in JavaScript, you can use the onload event. This event occurs when all of the content on the page, including images and scripts, have finished loading.

One way to attach a listener to this event is to use the window.onload property. Here's an example:

index.tsx
window.onload = function() {
  // Your code here
};
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You can also add an event listener to the window object using the addEventListener method, like this:

index.tsx
window.addEventListener('load', function() {
  // Your code here
});
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Both of these approaches will run the function specified when the page has finished loading, giving you access to the full DOM and any resources that may be needed.