js关于二维数组输出的问题

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<10;i++){
    if(infos[i][1]=="女" && infos[i][3]=="大一"){    //筛选出所有大一女生的信息
        for(var j=0;j<infos[i].length;j++){    //遍历一行里的每个元素
            document.write(infos[i][j]+" ");   //输出一行
        }
        document.write("<br/>");    //输出一行后换行，接着继续遍历下一行
    }
  }