第二次筛选为什么筛选不出来？
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<title>编程题</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']
];
/*document.write("筛选之后："+"<br/>");
for(i=0;i<=infos.length;i++){
if(infos[i][3]=="大一" && infos[i][1]=="女"){
document.write(infos[i]+"<br/>");
}
}*/
var n=0;
var arr=new Array();
for(i=0;i<=infos.length;i++){
if(infos[i][3]=="大一" ){
document.write(infos[i]+"<br/>");
arr[n]=infos[i];
n++;
}
}
for(var n=0;n<arr.length;n++){
if(arr[n][1]=="女"){
document.write(arr[n]+"<br/>");
}
}
</script>
</head>
<body>
<body>
</html>
qq_禁灭生_034145901回答
-
woshiajuana
for(i=0;i<=infos.length;i++) 这个错误 i不是小于等于，而是小于for(i=0;i<infos.length;i++) 总体代码<!DOCTYPE HTML><html><head> <meta http-equiv="Content-Type" content="text/html;charset=utf-8"> <title>编程题</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'] ]; /*document.write("筛选之后："+"<br/>"); for(i=0;i<=infos.length;i++){ if(infos[i][3]=="大一" && infos[i][1]=="女"){ document.write(infos[i]+"<br/>"); } }*/ var n=0; var arr=new Array(); for(var i=0; i < infos.length; i++){ if(infos[i][3] == "大一" ){ document.write(infos[i]+"<br/>"); arr[n]=infos[i]; n++; } } for(var n=0; n < arr.length; n++){ if(arr[n][1]=="女"){ document.write(arr[n]+"<br/>"); } } </script></head><body></body></html>
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