求助数组的问题
<!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">
var infos=new Array;
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"]
]
//第一步把之前的数据写成一个数组的形式,定义变量为 infos
for(i=0;i<infos.length;i++)
{if(infos[i][3])=="大一"&&infos[i][1]=="女"){
document.write(infos[i][0])
}}
//第一次筛选，找出都是大一的信息
//第二次筛选，找出都是女生的信息
</script>
</head>
<body>
</body>
</html>
没有输出名字啊
