///编辑
///撤销 WebBrowser1.ExecWB(OLECMDID_REDO ,1);
///重做 WebBrowser1.ExecWB(OLECMDID_UNDO ,1);
///-
///复制 WebBrowser1.ExecWB(OLECMDID_COPY,1);
///剪切 WebBrowser1.ExecWB(OLECMDID_PASTE,1);
///粘贴 WebBrowser1.ExecWB(OLECMDID_CUT ,1);
///删除 WebBrowser1.ExecWB(OLECMDID_DELETE,1);
///-
///全选 WebBrowser1.ExecWB(OLECMDID_SELECTALL,1);
///不选
WebBrowser1.ExecWB(OLECMDID_CLEARSELECTION,1);
