哪錯了 為什么輸出不了呢？
<!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(shù)據(jù)寫成一個數(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
?for(var i=0;i<infos.length;++i){
? ? ?
? ? ? ? ?if((infos[i][4]=="大一")&&(infos[i][2]=="女")){
? ? ? ? ? ? ?document.write(infos[i]);
? ? ? ? ?
? ? ? ? ?}
? ? ?}
??
?//第二次篩選，找出都是女生的信息
?
?
??
</script>
</head>
<body>
</body>
</html>
2016-08-12
(infos[i][4]=="大一")&&(infos[i][2]=="女")改成infos[i][3]=="大一" && infos[i][1]=="女"
2016-08-12
數(shù)組索引第一個是0，不是1