Question

我遇到了一些代码对我来说看起来很混乱，虽然我在很多地方搜索谷歌搜索，我找不到我的问题的确切答案。希望知道这个代码发生了什么，我在这里，问我是否有一个很好的解释，所以我不仅知道该怎么做，而且还要了解它的作用！

var fun = {
  a_method: function(){
    var f = function(){
      alert("FUN FUNNY FUNCTION");
    };
    f.another_method = function(){ // in this line, is another_method local or not? Because like mentioned f is local; how about another_method after the dot?
      alert("this is another method inside my fun method");
    };
    return f; // this is a local variable, why another_method isn't local?
  }() // these parentheses, what do they do in regards to the function?
};

return f做什么？为什么f.another_method(){function(){}}成为fun.a_method.another_method()＆lt; =这些括号让我感到困惑，因为如果f在a_method内是本地的，那么其他所有内容也不应该是本地的吗？与f.another_method(){function(){...}}一样，或者更清楚一点，我想知道为什么.another_method()在f之前有function(before the dot) return f的原因。并传递给another_method()？要在其中调用fun.a_method.another_method();而不是f，请查看混淆的位置。

fun.a_method.another_method()＆lt; =这些括号让我困惑 f.another_method(){function(){}};

我应该这样称呼它，但我不对（为什么，因为变量是本地的），这不是它如何与JS一起工作：

fun.a_method.f.another_method();

试着理解为什么不是上面的代替：

fun.a_method.another_method(); // note that it is without the "f" when it's called, now why not or "how it became this way"?

Answer 1

var anonymous = function(){var f = function(){alert()}; return f}();anonymous();
var anonimo = {method:function(){var f = function(){alert("this is an anonimous function")}; return f;}()}
anonimo.method();
var why = {method:function(){
var f = function(){
alert("this an anonymous function because the function was declared from a variable, is this right?")
};
f.notHere = function(){
alert("correct me if I'm wrong but, f is variable declared to an anonymous function just f alone \"notHere\"")
};
return f
}()};
why.method.notHere();
var lastScenario = {
method:function(){
var f = function(){};
f.notHere=function(){
alert("this will not work if I don't declare f as a function")
};return f}()};
lastScenario.method.notHere();

方法中的局部变量，并分配一个函数？

1 个答案: