This article mainly shares with you the js code to create a Map, hoping to help everyone.
function Map() { this.elements = new Array(); //获取MAP元素个数 this.size = function() { return this.elements.length; } //判断MAP是否为空 this.isEmpty = function() { return(this.elements.length < 1); } //删除MAP所有元素 this.clear = function() { this.elements = new Array(); } //向MAP中增加元素(key, value) this.put = function(_key, _value) { this.elements.push( { key : _key, value : _value }); } //删除指定KEY的元素,成功返回True,失败返回False this.remove = function(_key) { var bln = false; try{ for(i = 0; i < this.elements.length; i++) { if(this.elements[i].key == _key) { this.elements.splice(i, 1); return true; } } } catch(e) { bln = false; } return bln; } //获取指定KEY的元素值VALUE,失败返回NULL this.get = function(_key) { try{ for(i = 0; i < this.elements.length; i++) { if(this.elements[i].key == _key) { return this.elements[i].value; } } } catch(e) { return null; } } //获取指定索引的元素(使用element.key,element.value获取KEY和VALUE),失败返回NULL this.element = function(_index) { if(_index < 0 || _index >= this.elements.length) { return null; } return this.elements[_index]; } //判断MAP中是否含有指定KEY的元素 this.containsKey = function(_key) { varbln = false; try{ for(i = 0; i < this.elements.length; i++) { if(this.elements[i].key == _key) { bln = true; } } } catch(e) { bln = false; } return bln; } //判断MAP中是否含有指定VALUE的元素 this.containsValue = function(_value) { var bln = false; try{ for(i = 0; i < this.elements.length; i++) { if(this.elements[i].value == _value) { bln = true; } } } catch(e) { bln = false; } return bln; } //获取MAP中所有VALUE的数组(ARRAY) this.values = function() { var arr = new Array(); for(i = 0; i < this.elements.length; i++) { arr.push(this.elements[i].value); } return arr; } //获取MAP中所有KEY的数组(ARRAY) this.keys = function() { var arr = new Array(); for(i = 0; i < this.elements.length; i++) { arr.push(this.elements[i].key); } return arr; } } //new 一个Map就可以用了 var map = new Map();
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