To find the caller function, you need to use the non-standard feature “function.caller”. Previously, “argument.caller” property was considered, which is now obsolete.
Example
You can try to run the following function to get the caller function
Live Demo
<html>
<head>
<script type="text/javascript">
function Display() {
alert("caller is " + Display.caller);
}
</script>
</head>
<body>
<p>Click the following button:</p>
<form>
<input type = "button" onclick = "Display()" value="Get caller function">
</form>
</body>
</html>