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沒有任何顯示……

<!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">?//第一步把之前的數據寫成一個數組的形式,定義變量為?infos?var?infos=new?Array();
?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
??for(var?i=0;i<9;i++){
???????if(infos[i][3]==="大一"){?????
???????document.write(infos[i][0]);?????}?}?//第二次篩選，找出都是女生的信息
??for(var?i=0;i<9;i++){????
?????????if(infos[i][1]==="女"){????
??????????document.write(infos[i][0]);?????}?}
??????????</script>
??????????</head>
??????????<body>
??????????</body>
??????????</html>

歲月忽已晚_7

2018-08-05

源自：JavaScript進階篇 4-10

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2 回答

EricFn 回答被采納 +2 積分
2018-08-05

其實二維數組那個問題也能這么寫吧，只是你的代碼都是出于一些小問題，待優化:

<!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">
?//第一步把之前的數據寫成一個數組的形式,定義變量為?infos
?
?//第一次篩選，找出都是大一的信息
?
?//第二次篩選，找出都是女生的信息
?
?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?<?infos.length;?i++)?{
??????????if?(infos[i][3]?==?"大一")?{
??????????????if?(infos[i][1]?==?"女")?{
??????????????????document.write("大一的女生有:"?+?infos[i][0]?+?"<br>");
??????????}
??????}
??}
</script>
</head>
<body>
</body>
</html>