javascript中Map的应用

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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();
        this.elements.length = 0;
    };
    //向MAP中增加元素(key, value)
    this.put = function(_key, _value) {
        this.remove(_key);
        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) {
        var bln = 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;
    };
}



/*****************************测试页面    index.jsp*******************************/

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<script type="text/javascript" src="js/map.js"></script>
<title>map js Test</title>
</head>
<body>

</body>
<script type="text/javascript">
var map = new Map();
map.put("key0","value0");
map.put("key1","value1");
map.put("key2","value2");
map.put("key3","value3");
map.put("key4","value4");
map.put("key5","value5");
function Test(){
    if(map.size() > 0){
        var keys = map.keys();
        for(var i=0;i<keys.length;i++){
           alert("key:" + keys[i] + "value:" + map.get(keys[i]));
        }
    }
}

function TestRemove(){
    if(map.size() > 0){
        var keys = map.keys();
        for(var i=0;i<keys.length;i++){
           alert("动态移除key:" + keys[i]);
           map.remove(keys[i]);
        }
    }
}


function TestClear(){
    if(map.size() > 0){
       var keys = map.keys();
       alert("清空所用的keys:" + keys[i]);
       map.clear();
    }
}

 

function getValues(){
    if(map.size() > 0){
        var values = map.values();
        for(var i=0;i<values.length;i++){
           alert("value:" + values[i]);
        }
    }
}
</script>
</html>



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