//这种方法当弹出消息框时背景会变白
Response.Write("<script>alert('背景变白!');</script>");
Page.ClientScript.RegisterStartupScript(Page.GetType(), "message",
"<script language='javascript' defer>alert('背景没有变白!');</script>");
//.NET在后置代码中输入JS提示语句(背景不会变白)
Page.ClientScript.RegisterStartupScript(Page.GetType(), "message", "<script language='javascript' defer>alert('加入暂存架成功!');</script>");
//有转向
Page.ClientScript.RegisterStartupScript(Page.GetType(), "message", "<script language='javascript' defer>alert('恭喜您,修改成功!');window.location='Default.aspx'</script>");