请问如何用f8键单步调试<% %>中的代码？，谢谢
m1:c;
m2:c;
m3:c;
n1:=5;
n2:=10;
n3:=13;
<%
vc=ffl.vardata("m1")
vm1=ffl.vardata("m1")
vm2=ffl.vardata("m2")
vm3=ffl.vardata("m3")
vn1=ffl.vardata("n1")
vn2=ffl.vardata("n2")
vn3=ffl.vardata("n3")
vn1=vn1-1
vn2=vn2-1
vn3=vn3-1
for i=0 to Ubound(vm1)
if i>=vn1 then
vm1(i)=f(i,vn1)
end if
if i>=vn2 then
vm2(i)=f(i,vn2) '调用自定义过程(函数)f(i,vn2)
end if
if i>=vn3 then
vm3(i)=f(i,vn3) '调用自定义过程(函数)f(i,vn3)
end if
next
ffl.vardata("m1")=vm1
ffl.vardata("m2")=vm2
ffl.vardata("m3")=vm3
ffl.varStartIndex("m1")=vn1
ffl.varStartIndex("m2")=vn2
ffl.varStartIndex("m3")=vn3
'以下定义求Y日平均值的函数(过程)
function f(x,y)
sumc=0
'求Y日收盘价之和
for j=0 to y
sumc=sumc+vc(x-j)
next
'函数f返回Y日均价
f=sumc/(y+1)
end function
%>