问答详情
源自：4-10 编程练习

供大家参考

<!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=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']

    ]


 //第一次筛选，找出都是大一的信息

 var j=0;

 var childinfos=new Array();

 for(var i=0;i<infos.length;i++){

     switch(infos[i][3]){

         case "大一":

             childinfos[j]=infos[i];

             document.write(childinfos[j]+'<br/>');

             j++;

     }

     }

  document.write(childinfos.length+"<br/>");

  document.write("<br/>");

 //第二次筛选，找出都是女生的信息

 for(var k=0;k<childinfos.length;k++){

      if(childinfos[k][1]=="女"){

          document.write(childinfos[k][0]+'<br/>');

      }

  }

 

  

</script>

</head>

<body>

</body>

</html>


提问者：weibo_ 2016-07-15 10:53

个回答

  • 哥要奋斗
    2016-07-15 16:19:40

    <script type="text/javascript">

    function Stu(name,sex,age,grade){

     var stu = new Object()

    stu.name=name;

    stu.sex =sex;

    stu.age = age;

    stu.grade = grade;

    return stu;

    }

    var stus = [];

    stus[0] = Stu("小A","女",21,"大一");

    stus[stus.length] = Stu("小B","男",23,"大三");

    stus[stus.length] = Stu("小C","男",24,"大四");

    stus[stus.length] = Stu("小D","女",21,"大一");

    stus[stus.length] = Stu("小E","女",22,"大四");

    stus[stus.length] = Stu("小F","男",21,"大一");

    stus[stus.length] = Stu("小G","女",22,"大二");

    stus[stus.length] = Stu("小H","女",20,"大三");

    stus[stus.length] = Stu("小I","女",20,"大一");

    stus[stus.length] = Stu("小J","男",20,"大三");

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

    if(stus[i].sex=="女" && stus[i].grade =="大一"){

    document.write(stus[i].name+"<br/>");

    }

    </script>

    </head>

    <body>

    </body>

    </html>


    0
  • 苍惊雷
    2016-07-15 13:18:11

    var student=[['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<10;i++)

    if(student[i][3]=="大一"&&student[i][1]=="女")

    {document.write(student[i]+"<br>");}

    我这个比较简单，一次求出，没依次算大一和女生

    0
  • 轉身淚
    2016-07-15 13:11:13

    这个有点复杂了你的，
只需要
for(var i=0;i<infos.length;i++)
 {
     if(infos[i][3]=="大一")
     {
         if(infos[i][1]=="女")
         {
             document.write("大一女生的姓名为："+infos[i][0]+"<br>")
         }
     }
 }
 一个循环，和if判断嵌套就可以了，你这样有点麻烦了

    0