nodejs分页类代码分享_node.js

代码如下:
/**
* 分页插件类(缺少每页的显示数，listrows明天写)
* @param page {Number} 当前页
* @param pagesize {Number} 每页记录数
* @param total {Number} 总记录数
* @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;
}
}

/*
* 当前开始的条数
*/
Paginate.prototype.first = function(){
var first = (this.page-1)*this.pagesize;
if(first>this.total){
return (this.maxpage-1)*this.pagesize;
}
return first;
}
/*
* 当前页最大的条数
*/
Paginate.prototype.last = function(){
var last = this.first()+this.pagesize;
if(last>this.total){
return this.total;
}
return last;
}

/**
* 上一页
* @returns {number}
*/
Paginate.prototype.prev = function(){
if(this.page <= 1){
return false;
}
return this.page-1;
}

/**
* 下一页
* @returns {*}
*/
Paginate.prototype.next = function(){
if(this.page >= this.maxpage){
return false;
}
return (parseInt(this.page)+1);
}
module.exports = Paginate;

使用例子

代码如下:
var Paginate = require("../plugin/Paginate");
var q = req.query.q;
var paginate = new Paginate(q, 10, 185);
var page = paginate.page;//当前页数
var first = paginate.first();//当前第一条
var last = paginate.last();//当前最大条数
var maxpage = paginate.maxpage;//总页数
var pagesize = paginate.pagesize;//每页显示数
var total = paginate.total;//总记录数
var prev = paginate.prev();//上一条
var next = paginate.next();//下一条
res.json({page:page, first:first,last:last,maxpage:maxpage,pagesize:pagesize, total:total,prev:prev,next:next})