function call sequential using jquery ?

Question

function savedata() {

$.ajax({

url: 'http://localhost:29761/api/Value',

type: 'POST',

dataType: 'json',

success: function (data, textStatus, xhr) {

console.log(data);

//deferred.resolve(data);

},

error: function (xhr, textStatus, errorThrown) {

console.log('Error in Operation');

}

});

//return savedata();

}

function DelData() {

$.ajax({

url: 'http://localhost:29761/api/Value',

type: 'DELETE',

dataType: 'json',

success: function (data, textStatus, xhr) {

console.log(data);

},

error: function (xhr, textStatus, errorThrown) {

console.log('Error in Operation');

}

});

//return DelData();

}

function firstfunction() {

$.ajax({

url: 'http://localhost:29761/api/Value',

type: 'GET',

dataType: 'json',

(data, textStatus, xhr) {

console.log(data);

},

error: function (xhr, textStatus, errorThrown) {

console.log('a' + textStatus);

}

});

This is my code . How to call all this function in sequence using jqury . I will using .when() function but not run . Please my help .