var UUID = {
	createUUID : function(){
		var _self = this;
	    // Loose interpretation of the specification DCE 1.1: Remote Procedure Call
	    // since JavaScript doesn't allow access to internal systems, the last 48 bits 
	    // of the node section is made up using a series of random numbers (6 octets long).
	    //  
	    var dg = new Date(1582, 10, 15, 0, 0, 0, 0);
	    var dc = new Date();
	    var t = dc.getTime() - dg.getTime();
	    var tl = _self.getIntegerBits(t,0,31);
	    var tm = _self.getIntegerBits(t,32,47);
	    var thv = _self.getIntegerBits(t,48,59) + '1'; // version 1, security version is 2
	    var csar = _self.getIntegerBits(_self.rand(4095),0,7);
	    var csl = _self.getIntegerBits(_self.rand(4095),0,7);
	    // since detection of anything about the machine/browser is far to buggy, 
	    // include some more random numbers here
	    // if NIC or an IP can be obtained reliably, that should be put in
	    // here instead.
	    var n = _self.getIntegerBits(_self.rand(8191),0,7) + 
	            _self.getIntegerBits(_self.rand(8191),8,15) + 
	            _self.getIntegerBits(_self.rand(8191),0,7) + 
	            _self.getIntegerBits(_self.rand(8191),8,15) + 
	            _self.getIntegerBits(_self.rand(8191),0,15); // this last number is two octets long
	    return tl + tm  + thv  + csar + csl + n; 
	},
	
	
	
	/**
	 * 从URL里面获取UUID，然后从LocalStorage里面获取参数
	 */
	getParamFromLocalstorageByUrl : function (){
		var uuid = Common.getUuidFromUrl("uuid");
		if(uuid != undefined){
			var paramString = localStorage.getItem(uuid);
			if(paramString != null){
				var param = JSON.parse(paramString);
				return param;
			}
		}
	},
 
	//Pull out only certain bits from a very large integer, used to get the time
	//code information for the first part of a UUID. Will return zero's if there 
	//aren't enough bits to shift where it needs to.
	getIntegerBits : function(val,start,end){
		var base16 = this.returnBase(val,16);
		var quadArray = new Array();
		var quadString = '';
		var i = 0;
		for(i=0;i<base16.length;i++){
			quadArray.push(base16.substring(i,i+1));    
		}
		for(i=Math.floor(start/4);i<=Math.floor(end/4);i++){
			if(!quadArray[i] || quadArray[i] == '') 
				quadString += '0';
			else 
				quadString += quadArray[i];
		}
		return quadString;
	},
	 
	//Replaced from the original function to leverage the built in methods in
	//JavaScript. Thanks to Robert Kieffer for pointing this one out
	returnBase : function(number, base){
		return (number).toString(base).toUpperCase();
	},
	
	//pick a random number within a range of numbers
	//int b rand(int a); where 0 <= b <= a
	rand : function(max){
		return Math.floor(Math.random() * (max + 1));
	},
}