validateObservable在淘汰赛JS - undefined是不是一个函数

好日子，validateObservable在淘汰赛JS - undefined是不是一个函数

我想验证我的身边一个相当庞大的形式，基本上重写我的所有视图模型代码，以便它可以验证。问题是，由于某种原因，ko.validatedObservable（）似乎不存在。我使用了this site的代码，并且我真的无法看到我的代码中存在什么问题。下面是一个示例：

var someNameSpace= {}; 

    someNameSpace.bindData = function() { 
     someNameSpace.viewModel = 
     someNameSpace.initViewModel("123456", "username1", "address1", "address2", "city"); 

     ko.applyBindings(this.viewModel); 
    } 

someNameSpace.initViewModel = function (partnerId, username, address1, address2, city) { 
    console.log(ko); 
    var someViewModel = ko.validatedObservable({ //<----FAILS HERE 
     partnerId: ko.observable(partnerId).extend({ required: "This field is required", number: true }), 
     username: ko.observable(username).extend({ required: "This field is required" }), 
     address1: ko.observable(address1).extend({ required: "This field is required" }), 
     address2: ko.observable(address2).extend({ required: "This field is required" }), 
     city: ko.observable(city).extend({ required: "This field is required" }), 
    }); 

    var validationOptions = { insertMessages: true, decorateElement: true }; 
    ko.validation.init(validationOptions); 

    return someViewModel ; 
} 

$(document).ready(function() { 
    someNamespace.bindData(); 
});

在该网站上，它声称使用ko.validatedObservable以检查是否领域是由用户输入正确。我对淘汰赛仍然很陌生 - 我该怎么办？

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