为什么knockoutjs没有正确绑定？

Question

Why isn't this code not changing after 3 seconds? What am I doing wrong?

<div data-bind="visible: isBusy()">
is busy
</div>

<div data-bind="visible: !isBusy()">
is not busy
</div>



var viewModel;
function AppViewModel() {
    var self = this;
    self.isBusy = ko.observable(true);
}

function isNotBusyAnymore() {
    viewModel.isBusy = ko.observable(true);
}

viewModel = new AppViewModel();
ko.applyBindings(viewModel);
setTimeout(isNotBusyAnymore, 3000);

Answer 1

Because you keep making a new observable....and also your function always sets it to "true"

function isNotBusyAnymore() {
    viewModel.isBusy(false);
}