如何在Typescript中添加Knockout自定义函数

npm install knockout typescript --save

import * as ko from 'knockout';

ko.bindingHandlers.formatDate = {
  update: function(element, valueAccessor) {
    var value = ko.unwrap(valueAccessor());
    var formattedValue = formatDate(value); // 自定义的日期格式化函数
    element.textContent = formattedValue;
  }
};

function formatDate(date: Date): string {
  // 自定义的日期格式化逻辑
  return `${date.getFullYear()}-${date.getMonth() + 1}-${date.getDate()}`;
}

import * as ko from 'knockout';
import './customFunctions';

var viewModel = {
  currentDate: ko.observable(new Date())
};

ko.applyBindings(viewModel);

<p data-bind="formatDate: currentDate"></p>