一步到位，僅供參考
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????<meta?charset="UTF-8">
????<meta?name="viewport"?content="width=device-width,?initial-scale=1.0">
????<meta?http-equiv="X-UA-Compatible"?content="ie=edge">
????<title>4-10編程練習</title>
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<body>
????
????<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']?
????????]
????????for(var?i=0;i<10;i++){
????????????if(infos[i][3]=='大一'&&infos[i][1]=='女'){
????????????????document.write(infos[i][0]+"<br>");
????????????}
????????}
????</script>
</body>
</html>
2020-01-03
i<=infos.length會比較好吧
2020-01-02
因為infos[i][0]代表二維數組每一行第一列
2019-12-10
為什么infos[i][0]代表得出的結果呢
2019-11-29
輸出結果：
小A
小D
小I