这个谁能给解释一下？？？？
qq_枫_
2016-11-26 15:51
<!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 = [
['小A','女',21,'大一'],
['小B','男',23,'大三'],
['小C','男',24,'大四'],
['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>
1回答
-
- 清风拽拽3654857
- 2016-11-26 16:12:45
<!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>
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