JS自定义 Map 键值对对象

<script>  
function Map() {

this.keys = new Array();

this.data = new Array();

//添加键值对

this.set = function (key, value) {

if (this.data[key] == null) {//如键不存在则身【键】数组添加键名

this.keys.push(value);

}

this.data[key] = value;//给键赋值

};

//获取键对应的值

this.get = function (key) {

return this.data[key];

};

//去除键值，(去除键数据中的键名及对应的值)

this.remove = function (key) {

this.keys.remove(key);

this.data[key] = null;

};

//判断键值元素是否为空

this.isEmpty = function () {

return this.keys.length == 0;

};

//获取键值元素大小

this.size = function () {

return this.keys.length;

};

}

//test
var newMap=new Map();
newMap.set("1","Hello JS");
alert(newMap.get("1")); 
</script>