                        課程
                    
                        /前端開發
                        
                            /JavaScript
                        
                        /JavaScript進階篇

用switch，哪里錯了

		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++){
????	var?n?=?0;
????	var?arr=[];
????switch(infos[i][3]){
????	case?"大一":
????	??arr[n]=infos[i][3];
????	??break;
????	??default:
????	??document.write("<br>");
????	??n++;
????}}
????for(var?j=0;j?<arr.length;j++){
?????	switch(arr[j][1]){
?????		case?"女":
?????		document.write(arr[j][0]);
?????		break;
?????		default:
????	????document.write("<br>");
?????	}
????}

慕慕4512663

2017-05-28

源自：JavaScript進階篇 4-10

關注問題我要回答

1544

操作

收起

3 回答

慕勒7123956
2017-05-28

<!DOCTYPE??HTML>
<html?>
<head>
<meta?http-equiv="Content-Type"?content="text/html;?charset=utf-8"?/>
<title>流程控制語句</title>

</head>
<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']];
?????var?n?=?0;?var?arr=[];
????for(var?i=0;i<infos.length;i++){
???????
???????
????switch(infos[i][3]){
????????case?"大一":
??????????arr[n]=infos[i];
??????????n++;
??????????console.log(n);
??????????break;
??????????default:
??????????document.write("<br>");
??
?????????
????}};
????console.log(arr.length);
????for(var?j=0;j?<arr.length;j++){
???????switch(arr[j][1]){
???????????case?'女':
???????????document.write(arr[j][0]+"<br>");
???????????break;
???????????default:
????????????document.write("<br>");
??????????
???????}
????}

??
</script>
</body>
</html>