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我試圖在它的訂閱方法中讀取一個observable的值，它總是返回一個對象而不是應該是什麼值（true或false）。無法讀取訂閱方法中的可觀察值
退房小提琴或代碼如下： http://jsfiddle.net/StrandedPirate/WP3s9/
所有我想要的是隻有一個項目在一個observableArray有其isSelected屬性同時設置爲true。如果有另一種方式來做到這一點沒有循環或訂閱讓我知道，但這是我最終。
var menuViewModel = (function() {
function _constructor(error, details) {
var self = this;
self.items = ko.observableArray();
// add the menu items
self.items.push(new menuItemModel("Dashboard"));
self.items.push(new menuItemModel("Content Management"));
self.handleIsSelectedChange = function (item) {
// issue: item.isSelected() returns [object Object] instead of true/false
console.log("inside subscription function: " + item.title() + ", isSelected: " + item.isSelected());
// this fails because it doesn't return true/false it returns returns [object Object]
if (item.isSelected() === true) {
console.log("subscription fired: " + item.title());
// de-select all other items
ko.utils.arrayForEach(self.items(), function (subItem) {
if (subItem.title() !== item.title()) {
console.log("deselecting: " + subItem.title());
subItem.isSelected(false);
}
});
}
};
self.subscribeToItems = function() {
console.log("subscribeToItems called");
ko.utils.arrayForEach(self.items(), function (item) {
console.log("title: " + item.title() + ", isSelected: " + item.isSelected());
item.isSelected.subscribe(function (currentItem) {
self.handleIsSelectedChange(currentItem);
});
});
};
};
return _constructor;
})();
var menuItemModel = (function() {
function _constructor(title, icon) {
var self = this;
self.title = ko.observable(title || "");
self.icon = ko.observable(icon || "");
self.isSelected = ko.observable(false);
};
return _constructor;
})();
var menuVM = new menuViewModel();
menuVM.subscribeToItems();
ko.applyBindings(menuVM, $(".mainMenu").get(0));