deferred2.js

function A() {
    return $.ajax({
        url: 'http://echo.jsontest.com/a/1',
        success: function (data) {
            console.log(data);
        },
        error: function (data) {
            console.log(data);
        }
    });
}

function B(fromA) {
    console.log(fromA);
    
     return $.ajax({
        url: 'http://echo.jsontest.com/b/2',
        success: function (data) {
            console.log(data);
        },
        error: function (data) {
            console.log(data);
        }
    });
}

function C(fromB) {
    console.log(fromB);
    
     return $.ajax({
        url: 'http://echo.jsontest.com/c/3',
        success: function (data) {
            console.log(data);
        },
        error: function (data) {
            console.log(data);
        }
    });
}

function D(fromC){
    console.log(fromC);
}

$.when(A())
    .done(B)
    .done(C)
    .done(D);
    
//Object {a: "1"} 
//Object {a: "1"} 
//Object {a: "1"} 
//Object {a: "1"} 
//Object {b: "2"} 
//Object {c: "3"}