我在頁面上有一個元素，如下所示：<span data-bind="text: FormattedCountOfPeople"></span>計算它的函數我首先是這樣寫的：self.FormattedCountOfPeople = ko.computed(function () {    if(!self.PeopleCountFormatString)                 //a string like "{0} people in the conference", but set by a service call so starts out undefined      return "not set yet";    let sizes = self.Params().PermittedCounts();      //an array of discrete permitted sizes e.g. [2, 10, 30]    let size = self.Params().ChosenCount();           //value set by a jquery slider, could be any double, even 5.7435 - to achieve smooth dragging of the slider it has a small step but snaps to a permitted count    let n = nearest(size, sizes);                     //a "round to nearest" helper function that given args of e.g. (5.7345, [2, 10, 30]) will pick 2 because 5.7345 is nearer to 2 than 10    let s = self.PeopleCountFormatString.csFormat(n); //csformat is a helper function that performs C# style string Formatting e.g. "{0} people".csFormat(2) -> "2 people"    return s;});我繞了好幾個小時，想知道為什么無論滑塊設置是什么，頁面上的文本都卡在“尚未設置”處，但是作為測試添加的另一個元素正在完美更新，而其他地方有一個不同的<span data-bind="text: Params().ChosenCount"></span>滑塊使用類似的邏輯設置小時和分鐘的持續(xù)時間就可以了：//if the user picks 61.2345, it rounds to 60, then returns "1 hour". Picking 74.11 rounds to 75 then returns "1 hour, 15 min"self.FormattedDurationText = ko.computed(function () {    var duration = self.Params().ChosenDuration();      duration = Math.round(duration / 15) * 15;});在不同的地方添加一些控制臺日志記錄，很明顯，在第一次調用FormattedCountOfPeople返回“尚未設置”后，FormattedCountOfPeople拖動人數統(tǒng)計滑塊時再也不會被調用。直接綁定到原始數據的另一個范圍Params().ChosenCount會不斷更新，因此值可以正常變化。類似地，綁定到的滑塊Params().ChosenDuration正在更新值，并且FormattedDuration()每次值更改時都會被調用，并提供一個新的格式化字符串以進入范圍