var FrontPaging = function(nodeid,datas,pageSize,callBack){
	this.currentPage = 1;
	this.totalPages = 0;
	this.count = 0;
	//初始化
	this.init = function(){
		this.totalPages = parseInt((this.count + pageSize - 1) / pageSize);
		if(this.totalPages > 1){
			var html = '<nav>'
						+'<ul class="pagination"><li';
			if(!this.hasPrevPage()){
				html += ' class="disabled"';
			}
			html += ' id="firstPage"><a>&laquo;</a></li><li';
			if(!this.hasPrevPage()){
				html += ' class="disabled"';
			}
			html += ' id="prevPage">'
				      	+'<a>&lsaquo;</a>'
				    +'</li>';
			for(var i=0;i<this.totalPages;i++){
				html += '<li id="pageNum-'+(i+1)+'"';
				if(i == 0){
					html += ' class="disabled"';
				}else if(i >= 10){
					html += ' class="hide"';
				}
				html += '><a>'+(i+1)+'</a></li>';
			}
			html += '<li';
			if(!this.hasNextPage()){
				html += ' class="disabled"';
			}
			html += ' id="nextPage"><a>&rsaquo;</a></li><li';
			if(!this.hasNextPage()){
				html += ' class="disabled"';
			}
			html += ' id="lastPage"><a>&raquo;</a></li></ul></nav>';
			$("#"+nodeid).html(html);
			var thisClass = this;
			var getThisClass = function(){
				return thisClass;
			}
			$("#"+nodeid+" #firstPage").click(function(){
				if($(this).hasClass("disabled")){
					return;
				}
				thisClass.currentPage = 1;
				$(this).addClass("disabled");
				$("#"+nodeid+" #prevPage").addClass("disabled");
				$("#"+nodeid+" #nextPage,#"+nodeid+" #lastPage").removeClass("disabled");
				thisClass.commonMethod();
			});
			$("#"+nodeid+" #prevPage").click(function(){
				if($(this).hasClass("disabled")){
					return;
				}
				$("#"+nodeid+" #pageNum-"+(--thisClass.currentPage)).addClass("disabled");
				if(thisClass.hasPrevPage()){
					$(this).removeClass("disabled");
					$("#"+nodeid+" #firstPage").removeClass("disabled");
				}else{
					$(this).addClass("disabled");
					$("#"+nodeid+" #firstPage").addClass("disabled");
				}
				$("#"+nodeid+" #nextPage,#"+nodeid+" #lastPage").removeClass("disabled");
				thisClass.commonMethod();
			});
			$("#"+nodeid+" #nextPage").click(function(){
				if($(this).hasClass("disabled")){
					return;
				}
				$("#"+nodeid+" #pageNum-"+(++thisClass.currentPage)).addClass("disabled");
				if(thisClass.hasNextPage()){
					$(this).removeClass("disabled");
					$("#"+nodeid+" #lastPage").removeClass("disabled");
				}else{
					$(this).addClass("disabled");
					$("#"+nodeid+" #lastPage").addClass("disabled");
				}
				$("#"+nodeid+" #firstPage,#prevPage").removeClass("disabled");
				thisClass.commonMethod();
			});
			$("#"+nodeid+" #lastPage").click(function(){
				if($(this).hasClass("disabled")){
					return;
				}
				thisClass.currentPage = thisClass.totalPages;
				$("#"+nodeid+" #firstPage,#"+nodeid+" #prevPage").removeClass("disabled");
				$("#"+nodeid+" #nextPage,#"+nodeid+" #lastPage").addClass("disabled");
				thisClass.commonMethod();
			});
			$("#"+nodeid+" [id^='pageNum-']").click(function(){
				if($(this).hasClass("disabled")){
					return;
				}
				thisClass.currentPage = parseInt(this.id.split("-")[1]);
				if(thisClass.hasPrevPage()){
					$("#"+nodeid+" #firstPage,#"+nodeid+" #prevPage").removeClass("disabled");
				}else{
					$("#"+nodeid+" #firstPage,#"+nodeid+" #prevPage").addClass("disabled");
				}
				if(thisClass.hasNextPage()){
					$("#"+nodeid+" #nextPage,#"+nodeid+" #lastPage").removeClass("disabled");
				}else{
					$("#"+nodeid+" #nextPage,#"+nodeid+" #lastPage").addClass("disabled");
				}
				thisClass.commonMethod();
			});
		}
	}
	this.commonMethod = function(){
		$("#"+nodeid+" [id^='pageNum-']").removeClass("disabled");
		$("#"+nodeid+" #pageNum-"+this.currentPage).addClass("disabled");
		if(this.currentPage == 1){
			$("#"+nodeid+" [id^='pageNum-']").addClass("hide");
			for(var i=1;i<=10;i++){
				if(i > this.totalPages){
					break;
				}
				$("#"+nodeid+" #pageNum-"+i).removeClass("hide");
			}
		}else if(this.currentPage >= 5){
			var start = this.currentPage-5;
			var end = this.currentPage+5;
			if(this.currentPage > this.totalPages - 5){
				start = this.totalPages - 10;
				end = this.totalPages;
			}
			for(var i=1;i<=start;i++){
				$("#"+nodeid+" #pageNum-"+i).addClass("hide");
			}
			for(var i=start+1;i<=end;i++){
				$("#"+nodeid+" #pageNum-"+i).removeClass("hide");
			}
			for(var i=end+1;i<=this.totalPages;i++){
				$("#"+nodeid+" #pageNum-"+i).addClass("hide");
			}
		}
		this.getDatas();
	}
	//从服务端获取数据
	this.getDatas = function(){
		if(this.totalPages == 0){
			this.count = datas.length;
			this.init();
		}
		var start = (this.currentPage - 1) * pageSize;
		var end = start + pageSize;
		callBack(datas.slice(start,end));
	}
	//是否有上一页
	this.hasPrevPage = function(){
		if(this.currentPage > 1){
			return true;
		}
		return false;
	}
	//是否有下一页
	this.hasNextPage = function(){
		if(this.currentPage < this.totalPages){
			return true;
		}
		return false;
	}
	//第一次获取数据和总数
	this.getDatas();
}