JS 中的 map

js 中使用map和java HashMap 对比

方式一

var map = {}; // Map map = new HashMap();
map[key] = value; // map.put(key, value);
var value = map[key]; // Object value = map.get(key);
var has = key in map; // boolean has = map.containsKey(key);
delete map[key]; // map.remove(key);
// 遍历  
for(key in map){  
    alert(key + map[key]);  
}  
//长度判断
var length  = Object.keys(map).length ;

方式二：

var map={};

map.name='张三';

map.age=34;

var name=map.name;

var has = key in map;

delete map[key];

$.each(m,function(key,val){
alert(key+'   '+val);
});