用js寫了一個Map，帶遍歷功能，請大家點評下啦。
//map.js
Array.prototype.remove = function(s) { for (var i = 0; i < this.length; i++) { if (s == this[i]) this.splice(i, 1); } } /** * Simple Map * * * var m = new Map(); * m.put('key','value'); * ... * var s = ""; * m.each(function(key,value,index){ * s += index+":"+ key+"="+value+"/n"; * }); * alert(s); * * @author dewitt * @date 2008-05-24 */function Map() { /** 存放鍵的數組(遍歷用到) */ this.keys = new Array(); /** 存放數據*/ this.data = new Object(); /** * 放入一個鍵值對* @param {String} key * @param {Object} value */ this.put = function(key, value) { if(this.data[key] == null){ this.keys.push(key); } this.data[key] = value; }; /** * 獲取某鍵對應的值* @param {String} key * @return {Object} value */ this.get = function(key) { return this.data[key]; }; /** * 刪除一個鍵值對* @param {String} key */ this.remove = function(key) { this.keys.remove(key); this.data[key] = null; }; /** * 遍歷Map,執行處理函數* * @param {Function} 回調函數function(key,value,index){..} */ this.each = function(fn){ if(typeof fn != 'function'){ return; } var len = this.keys.length; for(var i=0;i<len;i++){ var k = this.keys[i]; fn(k,this.data[k],i); } }; /** * 獲取鍵值數組(類似Java的entrySet()) * @return 鍵值對象{key,value}的數組*/ this.entrys = function() { var len = this.keys.length; var entrys = new Array(len); for (var i = 0; i < len; i++) { entrys[i] = { key : this.keys[i], value : this.data[i] }; } return entrys; }; /** * 判斷Map是否為空*/ this.isEmpty = function() { return this.keys.length == 0; }; /** * 獲取鍵值對數量*/ this.size = function(){ return this.keys.length; }; /** * 重寫toString */ this.toString = function(){ var s = "{"; for(var i=0;i<this.keys.length;i++,s+=','){ var k = this.keys[i]; s += k+"="+this.data[k]; } s+="}"; return s; }; } function testMap(){ var m = new Map(); m.put('key1','Comtop'); m.put('key2','南方電網'); m.put('key3','景新花園'); alert("init:"+m); m.put('key1','康拓普'); alert("set key1:"+m); m.remove("key2"); alert("remove key2: "+m); var s =""; m.each(function(key,value,index){ s += index+":"+ key+"="+value+"/n"; }); alert(s); } //testMap.htm?<html> <head> <title>Test Map</title> <script language="javascript" src="map.js"> </script> </head> <body> <input type="button" value="test" onclick="testMap()"> </body> </html>以上這篇一個簡單的JavaScript Map實例(分享)就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持武林網。