为什么knockoutjs没有正确绑定？

Question

3秒后为什么this code没有变化？我做错了什么？

<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

因为你不断制作新的可观察物......而且你的功能总是将它设置为“真实”

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