JS Call apply: See if you've mastered the call and apply for JS?

There's a problem in the group:
What is the result of the following pop-up?
var a = function.prototype.call.apply (function (a) {return a}, [0,4,3])
Alert (a)
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RELATED links: about Call and apply
The result is 4, and the following is the process:
The Apply method is executed first, and then the following method is constructed
var B = (function (a) {alert (this);//0
return A;
). Call (0, 4, 3);
Alert (b)
Related applications:
Using function.prototype.call.apply to implement associative functions skillfully
var call = Function.prototype.call;
var mixin = function (that) {
for (var k)
THIS[K] = that[k];
return arguments.length = = 1?
This:call.apply (Arguments.callee, arguments);
}; This article links http://www.cxybl.com/html/wyzz/JavaScript_Ajax/20120708/31791.html