<script type="text/javascript">
var infos=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 i=0;i<=infos.length;i++)
{
if((infos[i][1]=="女"))&&((infos[i][3]=="大三"));
{
document.write("大一学生:"+infos[i][0]+"</br>");
}
}
//第二次筛选,找出都是女生的信息
</script>
第一:首先定义数组用的是'[]'括号;
第二:if里面的括号打的有问题;
第三:if后面不需要打的分号!!
正确的:
<script type="text/javascript">
var infos = [
['小A','女',21,'大一'],
['小B','男',23,'大三'],
['小C','男',24,'大四'],
['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 i=0;i<=infos.length;i++)
{
if(infos[i][3]=="大一" && infos[i][1]=="女")
{
document.write("大一学生:"+infos[i][0]+"</br>");
}
}
//第二次筛选,找出都是女生的信息
</script>
var 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']];
for(var i=0;i<=infos.length;i++)
{
if(infos[i][1]=="女"&&infos[i][3]=="大一")
{
document.write("大一学生:"+infos[i][0]+"</br>");
}
}
//第一步把之前的数据写成一个数组的形式,定义变量为 infos
var 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"]];
//第一次筛选,找出都是大一的信息
var newInfo=new Array();
for(i=0;i<infos.length;i++){
var info=infos[i];
var length=newInfo.length;
if(info[3]=="大一"){
newInfo[length]=info;
}
}
//第二次筛选,找出都是女生的信息
for(i=0;i<newInfo.length;i++){
var info=newInfo[i];
if(info[1]=="女"){
document.write(info[0]);
}
}