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                            /JavaScript
                        
                        /JavaScript進(jìn)階篇

幫我看看哪里有問(wèn)題，為什么顯示不了

<!DOCTYPE? HTML>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>流程控制語(yǔ)句</title>
<script type="text/javascript">

?//第一步把之前的數(shù)據(jù)寫(xiě)成一個(gè)數(shù)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 arr1=[];
?var n=0;
?for(var i=0;i<infos.length;i++)
?{
???? if(infos[i][3])=="大一"
???? {
???????? arr1[n]=infos[i];
???????? document.write(arr1[n]+"<br/>");
???????? n=n+1;
???? }

}
?
?? document.write("大一人數(shù): "+arr1.length+"<br/>"); ?

?//第二次篩選，找出都是女生的信息
?for(var i=0;i<arr1.length;i++)
?{
???? if(arr1[i][1]=='女')
???? {
???????? document.write(arr1[i][0]+'<br/>');
???? }
?}

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