You can also write your own custom components for application - specific purposes or for combining multiple html components together to form a composite - for example a data picker component that consists of three drop - down menus 您也可以为应用程序的特定目的,或者为了将多个html组件组合在一起形成一个复合体例如一个包含三个下拉菜单的data picker组件,而编写自己的自定义组件。