(function($){
	var ms={
		init:function(obj,args){
			/*if(window.localStorage){
				 alert('This browser supports localStorage');
			}else{
			 alert('This browser does NOT support localStorage');
			}*/
			var cacheData=window.localStorage.getItem("site_navs");//$(this).data("site_navs");
			
			if(!cacheData){
				$.getJSON(args.url,function(data){
					data=args.filter(data);
					//$(this).data("site_navs",data);
					window.localStorage.setItem("site_navs",JSON.stringify(data));
					ms.writeHtml(obj,data,args);
				});
			}else{
				ms.writeHtml(obj, $.parseJSON(cacheData),args);
			}
			
		},
		writeHtml:function(obj,data,args){
			var treenodes=ms.convertSimpleJsonToTree(args,data);
			var node=null;
			var htmlStr="";
			htmlStr=htmlStr+"<ul id='"+args.nav+"' class='nav1'>";
			for(var i=0;i<treenodes.length;i++){
				node=treenodes[i];
				htmlStr=htmlStr+ms.writeChild(obj,args,node,'nav2',i);
			}
			htmlStr=htmlStr+"<dv class='clear'></dv></ul>";
			obj.append(htmlStr);
			
		},
		writeChild:function(obj,args,node,navClz,i){
			var htmlStr="";
			var childs=null;
			var childnode=null;
			var target=node[args.navURL];
			var base=args.base;
			if(fnCheckSharp(target) || fnCheckHttp(target)){
				base="";
			}
			var clz='';
			var curSel=args.curSel;
			if(curSel){
				if(curSel==node.code){
					clz='hover';
				}
			}
			
			htmlStr=htmlStr+"<li class='"+clz+"'>"+"<a href='"+base+target+"'><p>"+node[args.textFiled]+"</p></a>";
			
			
			childs=node[args.childName];
			if(childs){
				htmlStr=htmlStr+"<ul class='"+navClz+"'>";
				for(var j=0;j<childs.length;j++){
					childnode=childs[j];
					htmlStr=htmlStr+ms.writeChild(obj,args,childnode,'nav3',1);
				}
				htmlStr=htmlStr+"</ul></li>";
				return htmlStr;
			}else{
				return htmlStr+"</li>";
			}
		},
		convertSimpleJsonToTree:function(args,data){
			var idFiled=args.idFiled;
			var parentField=args.parentField;
			var textFiled=args.textFiled;
			var childName=args.childName;
			var tempChildName='menus';
			if(childName){
				tempChildName=childName;
			}
			if (parentField) {
				idFiled =idFiled || 'id';
				textFiled =textFiled || 'text';
				parentField =parentField;
				
				var i,
				l,
				treeData = [],
				tmpMap = [];
				
				for (i = 0, l = data.length; i < l; i++) {
					tmpMap[data[i][idFiled]] = data[i];
					//tmpMap[data[i][idFiled]].state="closed";
				}
				
				for (i = 0, l = data.length; i < l; i++) {
					if (tmpMap[data[i][parentField]] && data[i][idFiled] != data[i][parentField]) {
						if (!tmpMap[data[i][parentField]][tempChildName])
							tmpMap[data[i][parentField]][tempChildName] = [];
						data[i]['text'] = data[i][textFiled];
						tmpMap[data[i][parentField]][tempChildName].push(data[i]);
						//tmpMap[data[i][parentField]].state="closed";
					} else {
						data[i]['text'] = data[i][textFiled];
						//data[i].state="closed";
						treeData.push(data[i]);
					}
				}
				return treeData;
			}
		}
		
	};
	function fnCheckHttp(s){   
		var patrn=/^(\w+:\/\/)/i; 
		if (!patrn.exec(s)){
			return false  
		} 
		return true
	} 
	function fnCheckSharp(s){   
		var patrn=/^#/; 
		if (!patrn.exec(s)){
			return false  
		} 
		return true
	} 
	$.fn.mynav=function(options){
		var args=$.extend({"idFiled":"id","parentField":"pid","textFiled":"text","childName":"menus","nav":"nav_id","navURL":"url","base":"","filter":function(vdata){ return vdata;}},options);
		return this.each(function(){
			ms.init($(this),args);
		});
	};
})(jQuery);