function updateuserlist1(){
var userlist = new Array("aa","bb","cc")
var i=0
while (i<userlist.length) {
var select1_1 = document.getElementById("Select1")
select1_1.options[i]= new Option(userlist(i),userlist(i))
alert(i)
i=i+1
}
}
提示第六行缺少函数？

userlist[i]