var infos=new Array()；

?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"]

]；

?//第一步把之前的數(shù)據(jù)寫成一個(gè)數(shù)組的形式,定義變量為 infos

?//第一次篩選，找出都是大一的信息

?

for(var i=0;i<infos.length;i++){

? if(info[i][3]=='大一'){

? document.write("大一學(xué)生的名字:"+infos[i][0])+"<br/>");

? }

?}

?

?//第二次篩選，找出都是女生的信息

?

?for(var j=0;j<infos.length;j++){

?if((infos[j][3]=='大一')&&(infos[j][1]=='女')){

? ?document.write("大一女生的名字:"+infos[j][0])+"<br/>");

?}

?}