var infos = [
    ['小A','女',21,'大一'],
 ['小B','男',23,'大三'],
 ['小C','男',24,'大四'],
 ['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 = 0; i < infos.length; i++) {
 if(infos[i][3] === "大一" && infos[i][1] === "女") {
  document.write(infos[i][0] + "<br />");
 }
}