請(qǐng)大神指教一下！
<!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">
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,"大三"],
["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(shù)據(jù)寫(xiě)成一個(gè)數(shù)組的形式,定義變量為 infos
?for(var i=0;i<=infos.length;i++)
?{
? ? ?if(infos[i][1]!="女"&&infos[i][3]!="大一"){continue;}
?document.write(infos[i][0]+"<br />")
?}
??
?//第二次篩選，找出都是女生的信息
?
?
??
</script>
</head>
<body>
</body>
</html>
為什么我這樣寫(xiě)的話輸出就有7個(gè)了，實(shí)際上符合"女","大一"的只有3個(gè)呀，是不不能寫(xiě)"!=&&!="這樣的語(yǔ)句呀?
2015-12-14
for(var?i?=?0;?i?<?infos.length;?i++)?{ if(infos[i][3]?==?"大一"?&&?infos[i][1]?==?"女")?{ document.write(infos[i][0]?+?"<br?/>"); } } 得這樣寫(xiě)哦～2015-12-14
這是判斷邏輯出現(xiàn)了問(wèn)題
2015-12-14
infos[i][1]!="女"&&infos[i][3]!="大一" ? ?你是把不滿足這個(gè)條件的輸出來(lái)，
這個(gè)條件的意思是 ，不是女的并且是大一的，
那么不滿足的意思就是， 女的或者是大一的輸出來(lái)