慕莱坞4298532
2018-11-16 09:20
<!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">
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][3]=="大一"&&infos[i][1]=="女"){
document.write(infos[i][0]);
}
//第一步把之前的数据写成一个数组的形式,定义变量为 infos
//第一次筛选,找出都是大一的信息
//第二次筛选,找出都是女生的信息
</script>
</head>
<body>
</body>
</html>
你的循环条件错了i<=infos.length;
应该是i<infos.length;去掉等于号"="
<!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 = new Array(
new Array("小A","女",21,"大一"),
new Array("小B","男",23,"大三"),
new Array("小C","男",24,"大四"),
new Array("小D","女",21,"大一"),
new Array("小E","女",22,"大四"),
new Array("小F","男",21,"大一"),
new Array("小G","女",22,"大二"),
new Array("小H","女",20,"大三"),
new Array("小I","女",20,"大一"),
new Array("小J","男",20,"大三"));
//第一次筛选,找出都是大一的信息
var grade ;
document.write(infos.length);
document.write(infos[1].length);
document.write("大一新生的信息有:<br/>");
for(var i= 0; i<infos.length;i++){
grade = infos[i][3];
if(grade == "大一"){
document.write(infos[i]+"<br/>");
}
}
//第二次筛选,找出都是女生的信息
document.write("全部女生的信息有:<br/>");
var gender ;
for(var i=0;i<infos.length;i++){
gender = infos[i][1];
if(gender == "女"){
document.write(infos[i]+"<br/>");
}
}
</script>
</head>
<body>
</body>
</html>
document.write(infos[i][0]);输出的时候是infos[i],不是infos[i][0]
for少个括号,还有输出的时候输出一维数组infos[i]
for少了个括号
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