var info = new Array[['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 a=0;a<=10;a++){

      if (info[a][3] == "大一") {

        document.write(info[a]);

      }

    }