Understanding of arguments, callee, caller, and arguments [0] in Javascript

Arguments. callee. Caller. Arguments [0]
Used to obtain event objects
Argument. callee is the function itself, and the caller function calls the function.
<Input type = 'text' value = 'click me' onkeydown = "dokeydown ('A')"/>
<SCRIPT type = "text/JavaScript">
Function dokeydown (ARG ){
VaR _ e = Window. Event | arguments. callee. Caller. Arguments [0];
Alert (arguments. callee );
// The dokeydown function definition is displayed.
// Function dokeydown (ARG ){
// VaR _ e = Window. Event | arguments. callee. Caller. Arguments [0];
// Alert (_ E );
// Alert (arguments. callee );
//}
Alert (arguments. callee. Arguments [0]);
// The "A" or "dokeydown" parameter is displayed.
Alert (arguments. callee. Caller );
// Display the definition of the onkeydown keyboard event Function
// Function onkeydown (event ){
// Dokeydown ("");
//}
Alert (arguments. callee. Caller. Arguments [0]);
// [Object keyboardevent] is the event object.
}
</SCRIPT>