在Javascript中将函数作为参数传递时返回值

Question

I have some javascript code that works fine when I pass an object to a method. In the API documentation , it says that I can also pass a function to the method. When I try this, I'm able to pass parameters and do an alert to verify that the parameters are being passed. However, I'm not able to return the value.

What is the line of javascript that I'm missing to properly return the value?

var result = {model: "todo"};

//$httpBackend.whenGET(/^\/api\//).respond(result);
$httpBackend.whenGET(/^\/api\//).respond(do_something);

function do_something(method, url, data) {
    alert("url "+url); // or whatever
    var result =  {model: "todo"};
    return result;
}

//From the API documentation
//   $httpBackend.whenGET('/.*/').respond(function(method, url, data) {
//     do something
//});

Answer 1

Presumably, the return value of that function is ignored. Certainly it's not being used in your current code.

You need to have that function affect a variable scoped outside of the function itself:

var result;
$httpBackend.whenGET(/^\/api\//).respond(do_something);
// Do something with `result`...
alert(result.model); // or whatever

function do_something(method, url, data) {
    alert("url "+url); // or whatever
    result =  {model: "todo"};
}