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if(TextBox1.Text.Trim() = "" || TextBox2.Text.Trim() = "" || TextBox3.Text.Trim() = "")
{}
<asp:TextBox ID="TextBox1" runat="server" onpropertychange='javascript:CurrentTextChange();'></asp:TextBox>
<asp:TextBox ID="TextBox2" runat="server" onpropertychange='javascript:CurrentTextChange();'></asp:TextBox>
<asp:TextBox ID="TextBox3" runat="server" onpropertychange='javascript:CurrentTextChange();'></asp:TextBox>
<script type="text/javascript">
function CurrentTextChange()
{
if(document.getElementById("TextBox1").value=="" ||document.getElementById("TextBox2").value==""||document.getElementById("TextBox3").value=="")
{
alert("不许空!");
}
}
</script>
if(textbox.Text=="")
{
Response.write("<script>alert('内容不能为空!!!')</script>");
return;
}