knockout.js - Knockout.js 运行时错误

Question

我正在尝试遍历集合中的项目列表并比较每个项目，如果要添加到集合中的项目的电子邮件地址已经存在，但出现运行时错误“JavaScript 运行时错误：预期功能”。请任何人帮助我下面的代码缺少什么？

视图模型

self.AddReceiver = function () {
        var newReceiverData = ko.toJS(self.newReceiver);
        if (ReceiverValidate()) {
            ko.utils.arrayForEach(self.receivers(), function (item) {
                if (item.EmailAddress() == newReceiverData.receiveremailaddress) {
                    alert("Email already exist on the list");
                    return false;
                }
            });
            self.receivers.push({
                EmailAddress: newReceiverData.receiveremailaddress,
                FirstName: newReceiverData.receiverfirstname,
                LastName: newReceiverData.receiverlastname
            });
            ClearReceiverInput();
        }
    }; 

截图错误

Answer 1

似乎 EmailAddress 不是可观察的。