构造:
function Map() {
this.keys = new Array();
this.data = new Array();
//添加键值对
this.set = function (key, value) {
if (this.data[key] == null) {//如键不存在则身【键】数组添加键名
this.keys.push(value);
}
this.data[key] = value;//给键赋值
};
//获取键对应的值
this.get = function (key) {
return this.data[key];
};
//去除键值,(去除键数据中的键名及对应的值)
this.remove = function (key) {
this.keys.remove(key);
this.data[key] = null;
};
//判断键值元素是否为空
this.isEmpty = function () {
return this.keys.length == 0;
};
//获取键值元素大小
this.size = function () {
return this.keys.length;
};
//遍历Map,执行处理函数. 回调函数 function(key,value,index){..}
this.each = function(fn){
if(typeof fn != 'function'){
return;
}
var len = this.keys.length;
for(var i=0;i<len;i++){
var k = this.keys[i];
fn(k,this.data[k],i);
}
};
//获取键值数组,返回键值对象{key,value}的数组
this.entrys = function() {
var len = this.keys.length;
var entrys = new Array(len);
for (var i = 0; i < len; i++) {
entrys[i] = {
key : this.keys[i],
value : this.data[i]
};
}
return entrys;
};
//重写toString方法
this.toString = function(){
var s = "{";
for(var i=0;i<this.keys.length;i++,s+=','){
var k = this.keys[i];
s += k+"="+this.data[k];
}
s+="}";
return s;
};
}
调用:
function testMap(){
var m = new Map();
m.put("key1","value1");
m.put("key2","value2");
m.put("key3","value3");
alert("init:"+m);
m.put("key1","value4");
alert("set key1:"+m);
m.remove("key2");
alert("remove key2: "+m);
var s ="";
m.each(function(key,value,index){
s += index+":"+ key+"="+value+"/n";
});
alert(s);
}