我做到第二步為什么不顯示？
<!DOCTYPE? HTML>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>流程控制語(yǔ)句</title>
<script type="text/javascript">
? var infos=new Array();
? infos[0]=new Array("小A","女",21,"大一");
? infos[1]=new Array("小B","男",23,"大三");
? infos[2]=new Array("小C","男",24,"大四");
? infos[3]=new Array("小D","女",21,"大一");
? infos[4]=new Array("小E","女",22,"大四");
? infos[5]=new Array("小F","男",21,"大一");
? infos[6]=new Array("小G","女",22,"大二");
? infos[7]=new Array("小H","女",20,"大三");
? infos[8]=new Array("小I","女",20,"大一");
? infos[9]=new Array("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
? ?for(var i=0;i<9;i++){
? if(infos[i][3]="大一"){
? ? ? document.write(infos[i][0]+"<br/>");
? ?}
? }
?//第一次篩選，找出都是大一的信息
?
2019-12-02
if語(yǔ)句這一行要用雙等號(hào)：?if (infos[i][3]=="大一")，才會(huì)篩選出所有大一的學(xué)生信息
2019-12-01
看一下你的代碼是不是缺少什么標(biāo)簽啊？我給補(bǔ)全之后，代碼暫時(shí)是沒(méi)有問(wèn)題的，是可以顯示的