Knockout.js: how to enhance the readability of Javascript part

Question

There is no doubt that Knockout.js is a very useful tool, which will save you from a lot of Javascript(Jquery) binding hassle, which will reduce your team's bug ratio concerning this part.

But unfortunately, its Javascript part gets ugly sooner than you can imagine, the resulting unreadable code is killing me and my team,

here you can find a simple example from the official website: http://knockoutjs.com/examples/twitter.html and this is an official example!

var savedLists = [
{ name: "Celebrities", userNames: ['JohnCleese', 'MCHammer', 'StephenFry', 'algore', 'StevenSanderson']},
{ name: "Microsoft people", userNames: ['BillGates', 'shanselman', 'ScottGu']},
{ name: "Tech pundits", userNames: ['Scobleizer', 'LeoLaporte', 'techcrunch', 'BoingBoing', 'timoreilly', 'codinghorror']}
];

var TwitterListModel = function(lists, selectedList) {
this.savedLists = ko.observableArray(lists);
this.editingList = {
    name: ko.observable(selectedList),
    userNames: ko.observableArray()
};
this.userNameToAdd = ko.observable("");
this.currentTweets = ko.observableArray([])

this.findSavedList = function(name) {
    var lists = this.savedLists();
    return ko.utils.arrayFirst(lists, function(list) {
        return list.name === name;
    });
};

this.addUser = function() {
    if (this.userNameToAdd() && this.userNameToAddIsValid()) {
        this.editingList.userNames.push(this.userNameToAdd());
        this.userNameToAdd("");
    }
};

this.removeUser = function(userName) { 
    this.editingList.userNames.remove(userName) 
}.bind(this);

this.saveChanges = function() {
    var saveAs = prompt("Save as", this.editingList.name());
    if (saveAs) {
        var dataToSave = this.editingList.userNames().slice(0);
        var existingSavedList = this.findSavedList(saveAs);
        if (existingSavedList) existingSavedList.userNames = dataToSave; // Overwrite existing list
        else this.savedLists.push({
            name: saveAs,
            userNames: dataToSave
        }); // Add new list
        this.editingList.name(saveAs);
    }
};

this.deleteList = function() {
    var nameToDelete = this.editingList.name();
    var savedListsExceptOneToDelete = $.grep(this.savedLists(), function(list) {
        return list.name != nameToDelete
    });
    this.editingList.name(savedListsExceptOneToDelete.length == 0 ? null : savedListsExceptOneToDelete[0].name);
    this.savedLists(savedListsExceptOneToDelete);
};

ko.computed(function() {
    // Observe viewModel.editingList.name(), so when it changes (i.e., user selects a different list) we know to copy the saved list into the editing list
    var savedList = this.findSavedList(this.editingList.name());
    if (savedList) {
        var userNamesCopy = savedList.userNames.slice(0);
        this.editingList.userNames(userNamesCopy);
    } else {
        this.editingList.userNames([]);
    }
}, this);

this.hasUnsavedChanges = ko.computed(function() {
    if (!this.editingList.name()) {
        return this.editingList.userNames().length > 0;
    }
    var savedData = this.findSavedList(this.editingList.name()).userNames;
    var editingData = this.editingList.userNames();
    return savedData.join("|") != editingData.join("|");
}, this);

this.userNameToAddIsValid = ko.computed(function() {
    return (this.userNameToAdd() == "") || (this.userNameToAdd().match(/^\s*[a-zA-Z0-9_]{1,15}\s*$/) != null);
}, this);

this.canAddUserName = ko.computed(function() {
    return this.userNameToAddIsValid() && this.userNameToAdd() != "";
}, this);

// The active user tweets are (asynchronously) computed from editingList.userNames
ko.computed(function() {
    twitterApi.getTweetsForUsers(this.editingList.userNames(), this.currentTweets);
}, this);
};

ko.applyBindings(new TwitterListModel(savedLists, "Tech pundits"));

// Using jQuery for Ajax loading indicator - nothing to do with Knockout
$(".loadingIndicator").ajaxStart(function() {
$(this).fadeIn();
}).ajaxComplete(function() {
$(this).fadeOut();
});

And of course, we have in our code base a lot more worse examples than that, a really bad ones!, specially with a more complicated business

So, do anyone know how to make Knockout.js's code more elegant & readable?