Javascript中数组与字典(即map)的使用（备忘）
简述：
简单记录一下数据结构Map和数组，
其实在Javascript这种弱类型的脚本语言中，数组同时也就是字典，下面主要就是字典数组的简易使用
代码：
1. 数组中添加map
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Test</title>
<script type="text/javascript">
var arr = [];
var key = 'Jeremy';
var value = '!!!!'
arr.push({
'key': key,
'value': value,
});
document.write("key: " + arr[0]['key'] +
"<br/>value: " + arr[0]['value']);
</script>
</head>
<body>
</body>
</html>
输出0：
2. 数组遍历输出
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Test</title>
</head>
<body>
<script type="text/javascript">
var arr = [];
arr.push("Jeremy");
arr.push("Jimmy");
for(var i in arr)
document.write(i + ": " + arr[i] + "</br>");
</script>
</body>
</html>
输出1：
3. 类似字典（map)遍历
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Test</title> </head> <body> <script type="text/javascript"> var dict = []; //or dict = new Array() dict["Jeremy"] = 20; dict["Jimmy"] = 30; for(var key in dict) document.write(key + ": " + dict[key] + "</br>"); </script> </body> </html>
输出2：
4. 字典声明时赋值
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Test</title>
</head>
<body>
<script type="text/javascript">
var dict = {
"Jeremy" : 20,
"Jimmy" : 30
};
for(var key in dict)
document.write(key + ": " + dict[key] + "</br>");
</script>
</body>
</html>
输出3：
5.字典中嵌套数组
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Test</title>
</head>
<body>
<script type="text/javascript">
var dict = {
"Jeremy" : ["Chinese", "Math"] ,
"Jimmy" : ["Art", "English"]
};
var name = "Jeremy";
for(var courseIndex in dict[name])
document.write(dict[name][courseIndex] + "</br>");
</script>
</body>
</html>
输:4：
6. 字典里value为数组， 数组内为字典，
下面的逻辑就是学生 ： 课程列表 ： 某门的课程信息
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Test</title>
</head>
<body>
<script type="text/javascript">
var dict = [];
var courseListOfJeremy = [
{"Chinese" : 3},
{"Math": 5}
];
dict['Jeremy'] = courseListOfJeremy;
var courseListOfJimmy = [
{"Art": 3},
{"English": 5}
];
dict['Jimmy'] = courseListOfJimmy;
document.write("Jimmy's Course Number Of Chinese: " + dict['Jeremy'][0]['Chinese']);
</script>
</body>
</html>
输出5：
