JS HashTable

来源：互联网发布：ubuntu 卸载mongodb 编辑：程序博客网时间：2024/05/22 15:06

<!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=gb2312">
<title>JS HashTable</title>
</head>
<script language="javascript" type="text/javascript">
function Hashtable()
{
this._hash = new Object();
this.add = function(key,value){
  if(typeof(key)!="undefined"){
   if(this.contains(key)==false){
    this._hash[key]=typeof(value)=="undefined"?null:value;
    return true;
   }else{
    return false;
   }
  }else {
   return false;
  }
}

this.remove = function(key){delete this._hash[key];}
this.count = function(){var i=0;for(var k in this._hash){i++;} return i;}
this.items = function(key){return this._hash[key];}
this.contains = function(key){ return typeof(this._hash[key])!="undefined";}
this.clear = function(){for(var k in this._hash){delete this._hash[k];}}
}
var a = new Hashtable();
a.add("1");
a.add("1");
a.add("3");
a.remove("4");
alert(a.contains("5"));
alert(a.contains("2"));
</script>