js的Map

模仿Map类
var map = {a:'140'};
map.b = 90;
map.c = 46;
map.a; //result:"140"
map.c; //result:46

其实map就是一对象,可以有属性和方法
var map;
map.a = 3;
map.b = 5;
map.c = 7;
map.say = function(){alert('Hello');}
map.a; //result:3
map.c; //result:7
map.say();

看下面代码
var people = new Object();
people.name = 'Bruce';
people.age = 27;
people.sayHello = function(){alert('Hello,My name is ' + this.name);}
people.sayHello();
//这里的var people = new Object();可以直接写成var people;,甚至不写.