<!DOCTYPE HTML>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>流程控制语句</title>
<script type="text/javascript">
//第一步把之前的数据写成一个数组的形式,定义变量为 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']
]
//第一次筛选,找出都是大一的信息
for(var i=0;i<infos.length;i++){
if(infos[i][3]=="大一"&&infos[i][1]=="女")
document.write(infos[i][0]);
}
//第二次筛选,找出都是女生的信息
</script>
</head>
<body>
</body>
</html>
还有
for(var i=0;i<infos.length;i++)
{
if(infos[i][3]=="大一"&&infos[i][1]=="女")
{
document.write(infos[i][0]);
}
}
数组间需要逗号分开
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']
]
改成
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']]
只是没加逗号。数组元素之间应该用逗号隔开
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']
]
没加逗号,改成
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']
]