javascript map函数

//自定义的Map 对象
function Map() {
    this.elements = new Array();

    this.keys = new Array();
    this.size = function() {
        return this.elements.length;
    }

    this.getKeys = function() {
        return this.keys;
    }
    this.put = function(_key, _value) {
        this.elements.push({key:_key,value:_value});

        this.keys.push(_key);
    }
    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;
    }

    // 判断是否存在此键
    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;
    }
    this.get = function(_key) {
        try {
            for (i = 0; i < this.elements.length; i++) {
                if (this.elements[i].key == _key) {
                    return this.elements[i];
                }
            }
        } catch(e) {
            return null;
        }
    }

    this.isEmpty = function(){
                return this.elements.length <= 0;
    }
}

 

 

 

//测试Map的调用方法
function testMap() {
    var testmap = new Map();
    testmap.put("01", "michael");
    testmap.put("02", "michael2");
    alert(testmap.size());
    var key = "02"
    if (testmap.containsKey(key)) {
        var element = testmap.get(key);
        alert(element.key + "|" + element.value);
    } else {
        alert("不包含" + key);
    }
    testmap.remove("02");
    if (testmap.containsKey(key)) {
        var element = testmap.get(key);
        alert(element.key + "|" + element.value);
    } else {
        alert("不包含" + key);
    }

    //迭代出所有的key对应的值

    for (each in testmap.getKeys()) {
         alert(testmap.getKeys()[each]);
    }
}