当鼠标移出灰色区域时候菜单项怎么隐藏起来

无标题文档 *{margin:10px; padding:0} #nav{border:#ccc 1px solid; height:25px; width:198px; text-align:center; line-height:25px; margin-bottom:0} #hover{ position:absolute; height:100px; width:200px; margin-top:-2px; text-align:center; background-color:#ccc; } 鼠标移上来 菜单一 菜单二 [Ctrl+A 全选 注: