留下一个JS的未了解问题

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var resultNum = function(){
	var num = 2;
	return function(){
		console.log(num);
		num--;
	}
}();


resultNum();  //2
resultNum();  //1

将上面代码和结果与下面的对比，为何有如此差异

var resultNum = function(){
	var num = 2;
	return function(){
		console.log(num);
		num--;
	}()
};


resultNum();  //2
resultNum();  //2

转载于:https://my.oschina.net/daladida/blog/906583