`

js封装hashMap并调用

    博客分类:
  • js
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 新建一个hashMap.js文件,文件内容如下:
Array.prototype.remove = function(s) {
	for (var i = 0; i < this.length; i++) {
		if (s == this[i])
			this.splice(i, 1);
	}
}

function HashMap() {
	this.keys = new Array();
	this.data = new Object();

	this.put = function(key, value) {
		if(this.data[key] == null){
			this.keys.push(key);
		}
		this.data[key] = value;
	};
	this.get = function(key) {
		return this.data[key];
	};
	this.remove = function(key) {
		this.keys.remove(key);
		this.data[key] = null;
	};
	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);
		}
	};
	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;
	};
	this.isEmpty = function() {
		return this.keys.length == 0;
	};
	this.size = function(){
		return this.keys.length;
	};
	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;
	};
}

function testMap(){
	var m = new HashMap();
	m.put('key1','Comtop');
	m.put('key2','key2内容');
	m.put('key3','key3内容');
	alert("init:"+m);
	
	m.put('key1','key1xxxx');
	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);
}
最底下有个testMap函数是可以调用的测试的例子。很简单方便。所以记录了下来

 

 

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