能实现窗口的一个浮动层功能，网页页面同时变灰，点击“确定”和“取消”按钮可以实现不同的动作，并且浮动层可实现鼠标移动。-Window to achieve a floating layer functionality, the web page at the same time is shaded, click OK and Cancel button can be achieved in different movements, and the floating layer can b