jquery - assign function return value to some variable using javascript

Question

I have a js function , after doing some business logic, the javascript function should return some result to another variable.Sample code below

var response="";
function doSomething() {  
    $.ajax({
        url:'action.php',
        type: "POST",
        data: dataString,
        success: function (txtBack) { 
            if(txtBack==1) {
                status=1;
            }
    });
    return status;     
}

Here i want to use like

response=doSomething();

I want to assign a return value "status" "var response".But the result is 'undefined'.

Answer 1

Or just...

var response = (function() {
    var a;
    // calculate a
    return a;
})();  

In this case, the response variable receives the return value of the function. The function executes immediately.

You can use this construct if you want to populate a variable with a value that needs to be calculated. Note that all calculation happens inside the anonymous function, so you don't pollute the global namespace.