一个简单的JavaScript数据缓存系统实现代码

var DataCache = function(){ 
if(!(this instanceof DataCache)){ 
return new DataCache(); 
} 
this.id = 0; 
this.caches = {}; 
}; 
DataCache.prototype = { 
add : function(val){ 
val = val || null; 
key = "dc_" + this.id; this.caches[key] = val; 
return key; 
}, 
remove : function(key){ 
delete this.caches[key]; 
}, 
get : function(key){ 
return this.caches[key]; 
}, 
set : function(key,val){ 
this.caches[key] = val; 
} 
};