请大家帮我看看这个代码有问题么？谢谢啦 很着急
<%OPTION EXPLICIT%><HTML>
<TITLE>定义和调用函数</TITLE>
<SCRIPT language="VBScript"runat=server>
Function add_num(num1,num2)
add_num=num1+num2
End Function
DIM a,b
a=4
b=12
Response.write a&"+"&b&"="&add_num(a,b)
</SCRIPT>
</HTML>
