nodejs 表格分页工具类

/**
 * Created by 26223 on 2016/11/13.
 */
const PageHelper = exports;
//页码
PageHelper.getPage = function (page) {
    return page == undefined ? -1 : page*1;
}
//每页行数
PageHelper.getRows = function(rows) {
    return rows == undefined ? 0 : rows * 1;
}
//跳过数
PageHelper.getSkip = function (page,rows) {
    var skip = (this.getPage(page) - 1) * this.getRows(rows) ;
    return skip == 0 ? 0 : skip;
}