?var student =? 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'],
???? );
???? alert(student.length);
??? for(i=0;i<10;i++){
??????? if((student[i][1]=="女")&&(student[i][3]=="大一")){
??????????? document.write(student[i][0]+"<br>");
??????? }
??? }