答案........
<!DOCTYPE HTML>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>流程控制语句</title>
<script type="text/javascript">
//创建数组
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']];
//通过length遍历数组
for(var i=0;i<infos.length;i++){
//条件判断出合适的
if(infos[i][3]=="大一"&&infos[i][1]=="女"){
document.write(infos[i][0])
}
}
</script>
</head>
<body>
</body>
</html>
