knockout.js动态字段绑定变量

Question

有没有办法动态替换ko.computed中写入和读取的字段？例如，使用此函数，我想将self.JobStartDate替换为我可以传入的变量fieldname：

function Job(data) {
    var self = this;
    ko.mapping.fromJS(data, {}, this); 

    var computedDateFn = {
        read: function() {
            return formatDate(ko.utils.unwrapObservable(self.JobStartDate), true);
        },

        write: function(value) {
            var jsonDate = "/Date(" + Date.parse(value).getTime();
            self.JobStartDate(jsonDate);
        }
    }

    this.formattedStartDate = ko.computed(computedDateFn);
    this.formattedEndDate = ko.computed(computedDateFn); // this guy would need the field it writes to/reads from to be self.JobEndDate
}

Answer 1

如果你使calculateDateFn成为一个接受你的fieldname为string并返回定义你的计算observable的对象的函数，你可以使用这样的数组表示法......

http://jsfiddle.net/bczengel/tMTCV/