/**
?* 分頁插件類(缺少每頁的顯示數，listrows明天寫)
?* @param page {Number} 當前頁
?* @param pagesize {Number} 每頁記錄數
?* @param total {Number} 總記錄數
?* @constructor
?*/
function Paginate(page, pagesize, total){
??? if(!page || page <1){
??????? page = 1;
??? }
??? if(!pagesize || pagesize<1){
??????? pagesize = 20;
??? }
??? if(!total || total <0){
??????? total = 0;
??? }
??? this.pagesize = pagesize;
??? this.total = total;
??? if(this.total%this.pagesize ===0){
??????? this.maxpage = parseInt(this.total/this.pagesize);
??? }else{
??????? this.maxpage = parseInt(this.total /this.pagesize) + 1;
??? }
??? if(page>this.maxpage){
??????? this.page = this.maxpage;
??? }else{
??????? this.page = page;
??? }
}

?

/*
* 當前開始的條數
*/
Paginate.prototype.first = function(){
??? var first = (this.page-1)*this.pagesize;
??? if(first>this.total){
??????? return (this.maxpage-1)*this.pagesize;
??? }
??? return first;
}
/*
* 當前頁最大的條數
*/
Paginate.prototype.last = function(){
??? var last = this.first()+this.pagesize;
??? if(last>this.total){
??????? return this.total;
??? }
??? return last;
}

/**
?* 上一頁
?* @returns {number}
?*/
Paginate.prototype.prev = function(){
??? if(this.page <= 1){
??????? return false;
??? }
??? return this.page-1;
}

/**
?* 下一頁
?* @returns {*}
?*/
Paginate.prototype.next = function(){
??? if(this.page >= this.maxpage){
??????? return false;
??? }
??? return (parseInt(this.page)+1);
}
module.exports = Paginate;

var Paginate = require("../plugin/Paginate");
var q = req.query.q;
var paginate = new Paginate(q, 10, 185);
var page = paginate.page;//當前頁數
var first = paginate.first();//當前第一條
var last = paginate.last();//當前最大條數
var maxpage = paginate.maxpage;//總頁數???
var pagesize = paginate.pagesize;//每頁顯示數
var total = paginate.total;//總記錄數
var prev = paginate.prev();//上一條
var next = paginate.next();//下一條
res.json({page:page, first:first,last:last,maxpage:maxpage,pagesize:pagesize, total:total,prev:prev,next:next})