//第一步把之前的數據寫成一個數組的形式,定義變量為 infos
?var a = new Array('小A','女',21,'大一');
?var b = new Array('小B','男',23,'大三');
?var c = new Array('小C','男',24,'大四');
?var d = new Array('小D','女',21,'大一');
?var e = new Array ('小E','女',22,'大四');
?var f = new Array ('小F','男',21,'大一');
?var g = new Array('小G','女',22,'大二');
?var h = new Array ('小H','女',20,'大三';
?var i = new Array('小I','女',20,'大一');
?var j = new Array ('小J','男',20,'大三');
var infos = new Array(a,b,c,d,e,f,g,h,i,j)
?//第一次篩選，找出都是大一的信息
?var n = 0;
?document.write(n)
?while(n<infos.length){
??? ?
???? if(infos[n][3]=="大一"){
???? document.write(infos[n][0]);
???? }
???? ++n;
??? }