js中的map

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看到网上很多的js的map实现，也自己实现了一个

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// map实现var map = new Object();map.put = function (key,value){var s = "map." + key + ' = "' + value + '";';eval(s);}map.get = function(key){var v = eval("map." + key + ";");return v;}map.keySet = function(){var keySets = new Array();for(key in map){if(!(typeof(map[key])=="function")){keySets.push(key);}}return keySets;}/* * use example */ /*map.put("a","Tom");map.put("b","Nick");var keys = map.keySet();for(i in keys){    key = keys[i];    alert("key:" + key + "  value:" + map.get(key));}* //* * end example */

现在，看到了关联数组，可以这用才模拟map

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var map = {};// putvar key = "key1";var value = "value1";map[key] = value;// getalert(map[key]);if("key1" in map) { //判断是否存在? alert("OK");}// 删除delete map["key1"]; // 遍历for(key in map){    alert(key + map[key]);}

还是这个好用!

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原理：

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Array本来就是一个 hashmap

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