问题已解决,谢谢了!
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首先將按鈕隱藏:<asp:Button ID="btnISShow" style="DISPLAY:NONE" runat="server" Text="Button" />
在FORM_LOAD中給文本框添加JS事件:
this.txtClick.Attributes.Add("onclick", "document.all.btnISShow.style.display='';");