alert弹出消息框，可画面没出来，全白的，怎么让画面现出来，再弹消息框呀？

[kikosisi]

我是在按下按钮后，出错的话，想弹出个消息框

[brightheroes]

this.Page.RegisterStartupScript("ErrorInfo","<script>alert('读取数据失败！');</script>");

不要用Page.Response.Write

[skyover]

window.onload=function(){alert("出错!");}

[luaiping]

用RegisterStartupScript

[mywisest]

this.Page.RegisterClientScriptBlock("ErrorInfo","<script>alert('读取数据失败！');</script>");

这样的写法，是先弹出所有控件的。

[xjjdanran]

this.Controls.Add(new LiteralControl("<script language=javascript>alert('hi!')</script>"))

[BoroSoft]

Response.Write("<script defer>alert('')</script>")