asp.net 服务器控件调用javascript

cs:

写在Page_Load 里面

Button1.Attributes.Add("onclick", "return fun(" + TextBox1.ClientID + "," + TextBox2.ClientID + ");");

aspx:

<script language ="javascript">

function fun(tname,tpwd)

{

if(tname.value=="")

{

alert("请输入用户名!");

return false;

}

if(tpwd.value=="")

{

alert("请输入密码!");

return false;

}

}

</script>