琢磨了俩小时。。。
<!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">
var infos=new Array();
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']
];
//第一步把之前的数据写成一个数组的形式,定义变量为 info
for(i=0;i<infos.length;i++)
{
switch(infos[i][3])
{
case "大一":
switch(infos[i][1])
{
case "女":
document.write("大一新生里面"+infos[i][0]+"是"+infos[i][1]+"<br>");
}
break;
}
}
</script>
</head>
<body>
</body>
</html>
谢谢,但是不是很懂
<!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 var m = 0; var n = 0; var infos1 = new Array(); for(var i = 0; i < infos.length; i++) { if(infos[i][infos[i].length-1] == "大一") { infos1[n] = new Array(); for(var j = 0; j <infos[i].length; j++){ infos1[n][m] = infos[i][j]; m++; } m = 0; n++; } } //输出大一学生所有信息 for(var i = 0; i < infos1.length; i++) { for(var j = 0; j< infos1[i].length; j++){ document.write(infos1[i][j] + " "); } document.write("<br />"); } document.write("<br/>"); //第二次筛选,找出都是女生的信息 for(var i = 0; i < infos1.length; i++){ if(infos[i][1] == "女") { for(var j = 0; j <infos[i].length; j++){ document.write(infos1[i][j] + " "); } document.write("<br />"); } } </script> </head> <body> </body> </html>
!!!