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<4;i++) {
infos[i] = new Array();
for (var j = 0; j < 10; j++) {
//第一次筛选，找出都是大一的信息
if (infos[i][3] = '大一' && infos[i][1] = '女') {
//第二次筛选，找出都是女生的信息
document.write(infos[i]);
}
}
2018-05-30
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>流程控制语句</title><script type="text/javascript">
//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 dayi = new Array();
var sub = 0;
document.write("大一学生有:");
for(var i=0; i<10; i++)
{
if( infos[i][3] == "大一")
{
dayi[sub++] = i;
document.write(infos[i][0]+",");
}
}
document.write("</br>女生为:");
//第二次筛选，找出都是女生的信息
for( var i=0; i<dayi.length; i++)
{
sub = dayi[i];
if( infos[sub][1] == "女")
document.write(infos[sub][0]+",");
}
</script>
</head>
<body>
</body>
</html><script language="javascript">
var myarray=[['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<myarray.length;i++)
{
for(var j=0;j<4;j++)
{
if(myarray[i][3]!="大一")
{ continue;
}
else if(myarray[i][1]!="女")
{continue;}
document.write(myarray[i][j]);
}
}
</script>
数组定义不对，应该用中括号[ ], 二维数组写反了顺序是先行后列，这个数组应该是10行4列，也就是说 i<10, j<4;
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,'大二']];
for(var i=0; i<infos.length; i++){
for(var j=0, j<4; j++){
if(infos[i][3] =="大一" && infos[i][1]=="女"){
document.write(infos[i][j]+“，”);
}
}
document.write("<br/>");
}
举报
