在单文档框架下，点击菜单弹出非模态对话框，该对话框显示当前时间(使用CStaticTime类制作)，对话框可随意拖拽。-Under the fr a mework of a single document, click on the menu pop-up non-modal dialog box that displays the current time (using CStaticTime class production), the dialog box can easily drag