答案，兩種方式實現，僅供參考
<!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">
? var infos = [["namea","女","25","大一"],["nameb","男","24","大四"],["namec","男","23","大三"],["named","女","24","大一"]];
??
?//第1種方式
?for(var count = 0;count< infos.length;count++){
? ? ? ? ?//infos[count].indexOf:數組中是否 包含指定字符串
? ? ? ? ?var isindexOf = infos[count].indexOf("大一");
? ? ? ? ?var isindexOf2 = infos[count].indexOf("女");
? ? ? ? ?//結果!-1說明包含?
? ? ? ? ?if(isindexOf!=-1 && isindexOf2!=-1){//說明包含大一女?
? ? ? ? ? ? ?document.write(infos[count]+"<br/>");
? ? ? ? ?}
? ? ? ? ?
? ? ?}
//第2種方式
? for(var count2 = 0;count2< infos.length;count2++){
? ? ? if(infos[count2][1]=="女" && infos[count2][3]=="大一"){
? ? ? ? ? ?document.write(infos[count2]+"<br/>");
? ? ? }
? }
?
??
</script>
</head>
<body>
</body>
</html>
2023-06-01
<!DOCTYPE? HTML>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></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']
];
for(var i = 0; i < infos.length; i++) {
if(infos[i][3] === "大一" && infos[i][1] === "女") {
document.write(infos[i][0] + "<br />");
}
}
</script>
</head>
<body>
</body>
</html>