请大神指教一下！
<!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=[
["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,"大三"],
["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(var i=0;i<=infos.length;i++)
{
if(infos[i][1]!="女"&&infos[i][3]!="大一"){continue;}
document.write(infos[i][0]+"<br />")
}
//第二次筛选，找出都是女生的信息
</script>
</head>
<body>
</body>
</html>
为什么我这样写的话输出就有7个了，实际上符合"女","大一"的只有3个呀，是不不能写"!=&&!="这样的语句呀?
