请问哪里出错了
var infos=[[('小A','女',21,'大一'],
['小B','男',23,'大三'],
['小C','男',24,'大四'],
['小D','女',21,'大一'],
['小E','女',22,'大四'],
['小F','男',21,'大一'],
['小G','女',22,'大二'],
['小H','女',20,'大三'],
['小I','女',20,'大一'],
['小J','男',20,'大三']];
for(var i=o;i<infos.length;i++)
if(infos[i][1]=='女'&&infos[i][3]=='大一')
{
document.write(infos[i][0])
}