Gets the function that invoked the current function.
The functionName object is the name of any executing function.
If the caller property is used in a string context, the result is the same as functionName.toString, that is, the decompiled text of the function is displayed.
The following example illustrates the use of the caller property:
Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards. Also supported in Windows Store apps. See Version Information.