                        課程
                    
                        /前端開發
                        
                            /JavaScript
                        
                        /JavaScript進階篇

檢查了代碼應該是沒有問題但是無顯示

<!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=[?['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?
?var?index=new?Array();?
?var?j=0;
??for(var?i=0;i++;i<infos.length){?????
??????if(infos[i][3]=='大一'){?????????index[j++]=i;?????}?}?
?//第二次篩選，找出都是女生的信息?
?for(var?i=0;i++;i<j){?????if(infos[index[i]][1]=='女');???
???document.write(infos[index[i]][0]+'<br/>');?}??
????</script></head><body></body></html>