Q536 How does a function know which object called it?

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A function can find out which function called it using the caller property:

<script language="JavaScript"><!--
function x() {
    alert('function x() was invoked by function ' + x.caller);
}

function y() {
    x();
}

y();
//--></SCRIPT>

A function can be easily passed the object in question using "this":

<script language="JavaScript"><!--
function test(what) {
    alert(what.href);
}
//--></script>