Javascript 敲除JSON不更新

在下面的小提琴中：

有一个名为jsonData的变量，它使用KO函数toJSON

为什么其他变量更新时它不更新？ 或者甚至在调用goCaps函数时

脚本：

function AppViewModel() {

    this.firstName = ko.observable("Bert");
    this.lastName = ko.observable("Bertington");

    this.fullName = ko.computed(function() {
        return this.firstName() + " " + this.lastName();    
    }, this);

    this.capitalizeLastName = function() {
        var currentVal = this.lastName();        // Read the current value
        this.lastName(currentVal.toUpperCase());

        this.data = ko.toJSON(this);

    };    
    this.data = ko.toJSON(this);
}
var appViewModel = new AppViewModel()
// Activates knockout.js


ko.applyBindings(appViewModel );

Html

姓氏：

名字：

姓氏：

全名：

盖帽
JSON:

​

您必须使

此数据可观察：

function AppViewModel() {

    this.firstName = ko.observable("Bert");
    this.lastName = ko.observable("Bertington");

    this.fullName = ko.computed(function() {
        return this.firstName() + " " + this.lastName();    
    }, this);

    this.capitalizeLastName = function() {
        var currentVal = this.lastName();        // Read the current value
        this.lastName(currentVal.toUpperCase());

        this.data(ko.toJSON(this));

    };    
    this.data = ko.observable(ko.toJSON(this));
}

.
此。数据似乎不是可观察的。如何使其成为可观察的？
function AppViewModel() {

    this.firstName = ko.observable("Bert");
    this.lastName = ko.observable("Bertington");

    this.fullName = ko.computed(function() {
        return this.firstName() + " " + this.lastName();    
    }, this);

    this.capitalizeLastName = function() {
        var currentVal = this.lastName();        // Read the current value
        this.lastName(currentVal.toUpperCase());

        this.data(ko.toJSON(this));

    };    
    this.data = ko.observable(ko.toJSON(this));
}