调用在 function 中定义的 function

Question

*Is there a way to call a function defined inside another function in javaSCRIPT? For example:

window.onload() = function() {
    function my_function(){
        print("Blah");
    };
};

function function_two(){
    my_function();
};

Is there a way to do something like the above (calling my_function in function_two even though it's defined inside the window.onload() function)? In my actual code, which also uses the raphael.js library, I'm trying to write a button in HTML, which using the onClick function, calls a function(like function_two) that runs the function defined in window.onload() (like my_function). However the console says that the my_function is undefined.

Answer 1

The scope of the function is the core issue here, as Zeychin and Trevor have said. I thought I'd offer another way of handling it. Basically, you can set your function to a variable that's in a higher scope (that is, accessible to both the onload and function_two functions), while defining it inside the onload function as you originally have:

var myFunction; //This is the placeholder which sets the scope

window.onload() = function() {
   myFunction = function() { //Assign the function to the myFunction variable
      print('blah');
   }
}

function function_two() {
   myFunction();
}

This might be handy if you only know the information you need for myFunction once you're in the onload event.

Answer 2

window.onload = function() {
    my_function()
};

function my_function(){
    alert("Blah");
};

function function_two(){
    my_function();
};

Answer 3

You can not do what you are asking to do. The function my_function() 's scope is only within the anonymous function, function() . It falls out of scope when the method is not executing, so this is not possible. Trevor's answer is the way to do this.