<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</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']];
var arr1=new Array();
var n=0;
for(i=0;i<infos.length;i++){
if(infos[i][3]=="大一"){
arr1[n]=infos[i];
document.write(arr1[n]+"<br/>");
n=n+1;
}
}
document.write("大一人数: "+arr1.length+"<br/>");
for(i=0;i<arr1.length;i++){
switch(arr1[i][1]){
case '女':
document.write(arr1[i]+"<br/>");
n=n+1;
}
}
</script>
</head>
<body>
</body>
将遍历得到的结果放到数组arr1中