JS自定义MAP对象

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/** * @version 1.0 * 用于实现页面 Map 对象，Key只能是String，对象随意 */var Map = function(){this._entrys = new Array();    this.put = function(key, value){        if (key == null || key == undefined) {            return;        }        var index = this._getIndex(key);        if (index == -1) {            var entry = new Object();            entry.key = key;            entry.value = value;            this._entrys[this._entrys.length] = entry;        }else{            this._entrys[index].value = value;        }            };    this.get = function(key){        var index = this._getIndex(key);        return (index != -1) ? this._entrys[index].value : null;    };    this.remove = function(key){        var index = this._getIndex(key);        if (index != -1) {            this._entrys.splice(index, 1);        }    };    this.clear = function(){        this._entrys.length = 0;;    };    this.contains = function(key){        var index = this._getIndex(key);        return (index != -1) ? true : false;    };    this.getCount = function(){        return this._entrys.length;    };    this.getEntrys =  function(){        return this._entrys;    };   this._getIndex = function(key){        if (key == null || key == undefined) {            return -1;        }        var _length = this._entrys.length;        for (var i = 0; i < _length; i++) {            var entry = this._entrys[i];            if (entry == null || entry == undefined) {                continue;            }            if (entry.key === key) {//equal                return i;            }        }        return -1;    };};
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