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第二步switch怎么實(shí)現(xiàn)？求解

<!DOCTYPE??HTML>
<html?>
<head>
<meta?http-equiv="Content-Type"?content="text/html;?charset=utf-8"?/>
<title>流程控制語句</title>
<script?type="text/javascript">

?//第一步把之前的數(shù)據(jù)寫成一個(gè)數(shù)組的形式,定義變量為?infos
?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']
????]
?//第一次篩選，找出都是大一的信息
?var?i=0;
?var?j=0;
?var?dy=?new?Array();
?for(i=0;i<infos.length;i++){
?????if(infos[i][3]=="大一"){
?????????dy[j]=infos[i];
?????????document.write(dy[j]+"<br/>");
?????????j++;
?????}
?}
?//第二次篩選，找出都是女生的信息
?
?for(j=0;?j<dy.length;j++){
?????if(dy[j][1]=="女"){
?????????document.write(dy[j][0]+"<br/>");
?????}
?}

</script>
</head>
<body>
</body>
</html>