引用：C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\15\ISAPI\Microsoft.Web.CommandUI.dll
后台代码：
SPRibbon ribbon = SPRibbon.GetCurrent(this.Page);
if (ribbon !=
null)
{
ribbon.Visible = false;
}
样式隐藏DIV高度
.ms-belltown-authenticated #s4-ribbonrow, .ms-belltown-authenticated
.ms-belltown-anonShow{
display:none;
}