asp 中for each类型不匹配

我是新手 刚学ASP  下面代码很简单
就是提示
Microsoft VBScript 运行时错误 错误 '800a000d'

类型不匹配: 'aaaaaaaaaaaaa'

不知道为什么 请各位大虾指点一番

a="aaaaaaaaaaaaa,bbbbbbbbbbbbb,cccccccccccc,dddddddddddd,eeeeeeeeee,ffffffffffff,gggggggggggggg,hhhhhhhhhhhhh"
a1=Split(a,",")

for each i in a1
response.write(a1(i))
Next

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VBScript code:

a="aaaaaaaaaaaaa,bbbbbbbbbbbbb,cccccccccccc,dddddddddddd,eeeeeeeeee,ffffffffffff,gggggggggggggg,hhhhhhhhhhhhh"
a1=Split(a,",")

for each i in a1
response.write i
Next

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hookee正确！for each是值遍历不是下标循环

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for i=0 to UBound(a1)
    response.write(a1(i))
Next