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这个谁能给解释一下？？？？

<!DOCTYPE HTML>

<html >

<head>

<title>流程控制语句</title>

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'],

];

for( var i=0;i<arm.length;i++)

{

switch(arm[i][1])

{

case '女':

document.write(arm[i][0]+"<br />");

}

//第一步把之前的数据写成一个数组的形式,定义变量为 infos

//第一次筛选，找出都是大一的信息

//第二次筛选，找出都是女生的信息

</script>

</head>

<body>

</body>

</html>

qq_枫_

2016-11-26

源自：JavaScript进阶篇 4-10

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1 回答

清风拽拽3654857
2016-11-26

<!DOCTYPE HTML>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>二维数组存储</title>
<script type="text/javascript">
window.onload=function() {

//把数据写成一个数组的形式,定义变量为 infos
var old = ["小A", "女", 21, "大一", "小B", "男", 23, "大三",
"小C", "男", 24, "大四", "小D", "女", 21, "大一"];
//定义变量递增遍历数组
var n = 0;
//将数组存为二维数组方便调用
var infos = new Array();
for (var i = 0; i < 4; i++) {
infos[i] = new Array();
for (var j = 0; j < 4; j++) {
infos[i][j] = old[n];
n++;
}
}
// alert(infos[3][0]);
//第一次筛选，找出都是大一的信息
var str="";
for (var i = 0; i < 4; i++) {
if (infos[i][3] == "大一") {
// alert(infos[i][0]);
// document.write("大一的有：" + infos[i][0] + "," + infos[i][1] + "," + infos[i][2] + "<br>");
str+=infos[i][0] + "," + infos[i][1] + "," + infos[i][2] + "<br>";
}
}
document.getElementById("myDiv").innerHTML =str;
/* document.write("<br><br><br>");
//第二次筛选，找出都是女生的信息
for (var i = 0; i < 4; i++) {
if (infos[i][1] == "女") {
// alert(infos[i][0]);
document.write("女生有：" + infos[i][0] + "," + infos[i][2] + "," + infos[i][3] + "<br>");
}
}*/
}

</script>
</head>
<body>
<div id="myDiv" style="width: 400px;height: 400px;background-color: #6CCDEE">显示信息块</div>
</body>
</html>