新手初学，请求加入。 说明使任意控件支持拖拽的方法，这是一个支持从IE浏览器拖拽的按钮，能显示被拖拽的内容的连接地址。-Novice beginner, request to join. Help make arbitrary controls support drag-and-drop method, which is a support from the IE browser, drag the button to show the contents of drag link addre