JS实现简单hashtable
JS实现简单自定义hashtable代码 如下：
```
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]; } }
}
```
我的笔记