//window._={};
(function(_){
	if (!_) return;
	_.pages = function(os){//可以使用name来绑定click事件,再取page/li属性使用
	//console.log(os);
		var ops = {
			count:0 //记录数
			, page:0 //当前页
			, li:0 //或当前记录数
			, pre:'jsPage' //class,id之类前缀
			, side:5 //当前页左右数字页个数
			, per:5 //每页条数
			, first:'' //显示首页(字符)
			, last:'' //显示末页(字符)
			, prev:'' //显示上页(字符)
			, next:'' //显示下页(字符)
			, prevg:'' //前节(字符):足够前移一组,且不是1
			, nextg:'' //后节(字符):足够后移一组,且不是末页
			, url:'javascript:;' //page的url,放置字符*会替换成页码
			, target:'_self' //页码打开窗口
			, jump:'' //跳转form的action,*替换成输入页码,
			, attrs:'' //附加到a标签上的其它js属性,如data="11" pid="2" aid="3"
		};    

		var ma = function(p,t,c,a){return '<a ' +(strN0(ops.attrs) ? ops.attrs:'')+ ' href="' +purl(p)+ '" class="' +ops.pre+(c ? c : 'Pages')+ '" target="' +ops.target+ '" page="' +p+ '" li="' +(p*ops.per)+ '" name="' +ops.pre+ 'Pages" title="' +(a ? a : '点击打开第' +p+ '页')+ '">' +(t ? t : p)+ '</a>\n'};
		var isset = function(v){return 'undefined' != typeof v;};
		var strN0 = function(v){return 'string' == typeof(v) && !/^\s*$/.test(v) ? 1 : 0;};//非空字符
		for (var o in os)  isset(ops[o]) && (ops[o] = os[o]);
		var overp = function(n){return n>ops.maxp ? ops.maxp : n;};//大于最大页回最大页
		var pages = '';
		var p2l = function(p){return p*ops.per};//页转记录数
		var purl = function(p){return ops.url.replace('*', p);};//返回页码url
		(isNaN(ops.per) || ops.per < 1) && (ops.per = 5);
		if (isNaN(ops.count) || !ops.count || (ops.count <= ops.per) ) return pages;//只有一页
		ops.maxp = Math.floor(ops.count/ops.per) + (ops.count%ops.per ? 1 : 0);//最大页  

		if (0 < ops.li) {
			ops.li > ops.count && (ops.li = ops.count);	
			ops.page = Math.floor(ops.li/ops.per) + (ops.li%ops.per ? 1 :0);//数据位移转换成页,余+1
		} else if (ops.page > 1){      	
			ops.page > ops.maxp && (ops.page = ops.maxp);
			ops.li = ops.page*ops.per;
		} else {
			ops.li = 0;
			ops.page = 1;
		}

		ops.nums = ops.side*2+1;//总数字页为*2+1        
		
		if (ops.page > ops.side+1) {//只有前面出现省略时才需要出现
			if (strN0(ops.first)) pages += ma(1,ops.first,'first');				
			if (strN0(ops.prev)) pages += ma(ops.page-1,ops.prev,'prev');
		}
		
		var prevp = ops.page - ops.nums;
		if (strN0(ops.prevg) && prevp > 1 ) pages += ma(prevp,ops.prevg,'prevg');//只有前面出现省略时才需要出现,1已经有首页不必出现

		for  (var fi = ops.side, sidel=sider='',pl=pr=ops.page;fi >0; fi--) {			
			if (--pl >= 1)  sidel = ma(pl) + sidel;			
			if (++pr <= ops.maxp)  sider += ma(pr);			
		}
		
		pages += sidel + '<a href="javascript:;" target="_self" class="' +ops.pre+ 'Page" title="当前页页码">' +ops.page+ '</a>'+ sider;
		var nextp = ops.page + ops.nums;
		if (strN0(ops.nextg) && ops.maxp > nextp ) pages += ma(nextp,ops.nextg, 'nextg');//只有后面不显全      
		//跳转
		if (strN0(ops.jump) && (ops.page > ops.side || ops.maxp-ops.page >ops.side))
			pages += '<form target="' +ops.target+ '" class="' +ops.pre+ 'form" method="POST" onsubmit="' 
				+ "return (function(t){var i=t.elements[0];i=i.value=i.value.replace(/\\D/g,'');return i>0?t.action='" 
				+ops.jump+ "'.replace('*', i):false;})(this);"
				+ '">\n'
				+ '<input class="' +ops.pre+ 'input" title="输入合法的页码,回车确认跳转到输入的页"/>'
				+ '</form>\n';
		if (ops.maxp- ops.page > ops.side) {//只有后面不显全
			if (strN0(ops.next)) pages += ma(ops.page+1,ops.next,'next');			
			if (strN0(ops.last)) pages += ma(ops.maxp,ops.last, 'last');
		}
		return pages;
	}
})(window._);
//document.body.innerHTML = _.pages({count:13, page:1, per:1, side:1, first:'f', prev:'p', next:'n', last:'l', nextg:'>>>', prevg:'<<<', jump:'http://local.q/?kkkk=*', target:'_blank'});