<!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=[???['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']?];
?//第一步把之前的數據寫成一個數組的形式,定義變量為?infos
?var?arr=[];
?for(var?i=0;i<infos.length;i++)
?{
?????if(infos[i][3]=='大一')
?????{
?????????var?n=0;
?????????arr[n]=infos[i];
?????????document.write(arr[n]+"<br/>");
?????????n++;
?????}??
?}
?//第一次篩選，找出都是大一的信息
??for(var?i=0;i<arr.length;i++)
??{
??????if(arr[i][1]=='女')
??????{
??????????document.write(arr[i][0]+"<br/>");
??????}
??}
?//第二次篩選，找出都是女生的信息
?</script>
</head>
<body>
</body>
</html>
為什么我在if語句中初始化n時最后篩選的女生顯示答案只有小I一個？
fighting加油吧
2016-09-16 15:15:00
