为什么我写的代码没反应?
<!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(var i=0;i<infos.length;i++){
var infos[i]=new Array();
if(infos[i][4]=="大一"&&infos[i][2]=="女"){
document.write("大一的女生信息如下:"+infos[i]);
}
}
//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>