js creates a Map code to share

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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