js中map的使用.docxVIP

html head titleTest Map/title script type=text/javascript!-- /** * 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() { /** 存放键的数组(遍历用到) */ this.keys = new Array(); /** 存放数据 */ this.data = new Object(); /** * 放入一个键值对 * @param {String} key * @param {Object} value */ this.put = function(key, value) { if(this.data[key] == null){ this.keys.push(key); } this.data[key] = value; }; /** * 获取某键对应的值 * @param {String} key * @return {Object} value */ this.get = function(key) { return this.data[key]; }; /** * 删除一个键值对 * @param {String} key */ this.remove = function(key) { this.keys.remove(key); this.data[key] = null; }; /** * 遍历Map,执行处理函数 * * @param {Function} 回调函数 function(key,value,index){..} */ this.each = function(fn){ if(typeof fn != function){ return; } var len = this.keys.length; for(var i=0;ilen;i++){ var k = this.keys[i]; fn(k,this.data[k],i); } }; /** * 获取键值数组(类似Java的entrySet()) * @return 键值对象{key,value}的数组 */ 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; }; /** * 判断Map是否为空 */ this.isEmpty = function() { return this.keys.length == 0; }; /** * 获取键值对数量 */ this.size = function(){ return this.keys.length; }; /** * 重写toString */ this.toString = function(){ var s = {; for(var i=0;ithis.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,aaa); m.put(key2,bbb); m.put(key3,ccc); alert(init:+m); m.put(key1,aaaxg); 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);} //--/script/head body input typ