JavaScript实现Map功能

来源：互联网发布：fm2016数据库编辑：程序博客网时间：2024/06/15 20:12

JavaScript中没有类似Java中的Map集合类的实现，自己做了简单实现，如下：

function Map() {this.elements = new Array();this.size=function(){return this.elements.length;};this.isEmpty=function(){return (this.elements.length < 1);};this.clear=function(){this.elements=new Array();};this.put=function(_key,_value) {if (!this.containsKey(_key)) {this.elements.push({key:_key,value:_value});} else {for (var i = 0; i < this.elements.length; i++) {if (this.elements[i].key === _key) {this.elements[i].value = _value;}}}};this.remove=function(_key) {for (var i = 0; i < this.elements.length; i++) {if (this.elements[i].key === _key) {this.elements.splice(i, 1);return;}}};this.get=function(_key) {try {for (var i = 0; i < this.elements.length; i++) {if (this.elements[i].key === _key) {return this.elements[i].value;}}} catch(e) {return null;}return null;};this.containsKey=function(_key) {try {for (var i = 0; i < this.elements.length; i++) {if (this.elements[i].key===_key) {return true;}}} catch (e) {return false;}return false;};this.entryArray = function() {var eArr = [];try {for (var i = 0; i < this.elements.length; i++) {eArr.push(new Entry(this.elements[i].key, this.elements[i].value));};} catch (e) {return eArr;}return eArr;};function Entry(key, value) {this.key = key;this.value = value;}}

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