javascript - 默认调用函数？

Question

有可能做这样的事情吗？

var foo;
foo.bar = function { };
foo.variable1 = "Hello World";
foo.variable2 = 5;

...并以某种方式做到这一点，以便我可以：

function example() {
    foo(); // <-- have this call foo.bar()
    foo.variable1 = "Goodbye World"; // <-- but still have this work 
    }

Answer 1

是的。函数也只是对象。

var foo = function () { alert("Hi!") };
foo.variable1 = "Hello world";

console.log(foo.variable1);
foo();

Answer 2

比你想象的要容易。

var foo = function() {
  foo.bar();
};

foo.bar = function() {
  console.log('Hello World. '+ foo.variable1);
};

foo.variable1 = "Goodbye World";

foo(); // "Hello World. Goodbye World"