JS自定義 Map 鍵值對對象

<script>  
function Map() {

this.keys = new Array();

this.data = new Array();

//添加鍵值對

this.set = function (key, value) {

if (this.data[key] == null) {//如鍵不存在則身【鍵】數組添加鍵名

this.keys.push(value);

}

this.data[key] = value;//給鍵賦值

};

//獲取鍵對應的值

this.get = function (key) {

return this.data[key];

};

//去除鍵值，(去除鍵數據中的鍵名及對應的值)

this.remove = function (key) {

this.keys.remove(key);

this.data[key] = null;

};

//判斷鍵值元素是否爲空

this.isEmpty = function () {

return this.keys.length == 0;

};

//獲取鍵值元素大小

this.size = function () {

return this.keys.length;

};

}

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