2回答

• 

  millia

  2019-05-20 16:23:42

  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']
             ]
  var i = infos.length;
  var y;
  for(y=0;y<i;y++){
      var yy = infos[y][3];//获取年级
      var yx = infos[y][1];//获取性别
      switch(yx){
          case "女":
          if(yy=="大一"){
              document.write("大一女生姓名:"+infos[y][0]+"<br>");
          }
         break;
      }
  }

  
  

  0 0
• 

  我的梦丶加油少年

  2019-05-17 20:08:15

  和if的道理相同

  0 0