layui table默认跳页后不存在源页面选中的状态。如果要实现记录源页面的选中状态，需要定义一个全局变量来记录数据选中状态。

1、修改table.js

;layui.define(["laytpl", "laypage", "layer", "form"], function (e) {
 "use strict";
 var t = layui.$, i = layui.laytpl, a = layui.laypage, l = layui.layer, n = layui.form, o = layui.hint(),
  r = layui.device(), d = {
   //layuiPageCheckedIds变量记录选中的数据id，格式是“,1,2,3,4,”的字符串
   config: {checkName: "LAY_CHECKED", indexName: "LAY_TABLE_INDEX", layuiPageCheckedIds: ","},
   cache: {},
   index: layui.table ? layui.table.index + 1e4 : 0,
   set: function (e) {
    var i = this;
    return i.config = t.extend({}, i.config, e), i
   },
   on: function (e, t) {
    return layui.onevent.call(this, s, e, t)
   }
  }
  
  ...
  
  S.prototype.pullData = function (e, i) {
  var a = this, n = a.config, o = n.request, r = n.response, d = function () {
   "object" == typeof n.initSort && a.sort(n.initSort.field, n.initSort.type)
  };
  if (a.startTime = (new Date).getTime(), n.url) {
   var c = {};
   //在发送请求前将选中的数据放入条件中
   if(n.layuiPageCheckedIds != undefined && "" != n.layuiPageCheckedIds){
    n.where.layuiCheckedIds = n.layuiPageCheckedIds;
   }
   if(tableRender){
    var currPageNumber = getPageNumber();
    c[o.pageName] = currPageNumber;
    tableRender = false;
   }else{
    setPageNumberCookie(e);
    c[o.pageName] = e;
   }
   c[o.limitName] = n.limit;
   t.ajax({
    type: n.method || "get",
    url: n.url,
    data: t.extend(c, n.where),
    dataType: "json",
    success: function (t) {
     if(null != startLoading){
      layer.close(startLoading);
      startLoading = null;
     }
     return t[r.statusName] != r.statusCode ? (a.renderForm(), a.layMain.html('<div class="' + f + '">' + (t[r.msgName] || "返回的数据状态异常") + "</div>")) : (a.renderData(t, e, t[r.countName]), d(), n.time = (new Date).getTime() - a.startTime + " ms", i && l.close(i), void("function" == typeof n.done && n.done(t, e, t[r.countName])))
    },
    error: function (e, t) {
     a.layMain.html('<div class="' + f + '">数据接口请求异常</div>'), a.renderForm(), i && l.close(i)
    }
   });
  } else if (n.data && n.data.constructor === Array) {
   if(null != startLoading){
    layer.close(startLoading);
    startLoading = null;
   }
   var s = {}, u = e * n.limit - n.limit;
   s[r.dataName] = n.data.concat().splice(u, n.limit), s[r.countName] = n.data.length, a.renderData(s, e, n.data.length), d(), "function" == typeof n.done && n.done(s, e, s[r.countName])
  }
 }
 ...
 //在文件的最后添加设置选中变量的方法
 //设置初始选中值
 ,d.initPageCheckedIds=function(e,i){
  if(i == undefined || i == ""){
   i = "";
  }
  if(i.length > 0 && "," != i.substring(0,1)){
   i = "," + i;
  }
  if(i.length > 0 && "," != i.substring(i.length - 1, i.length)){
   i = i + ",";
  }
  c.config[e].layuiPageCheckedIds = i;
 },
 //获取选中的ids, 参数e表示table的id
 d.getLayuiPageCheckedIds=function (e) {
   return c.config[e].layuiPageCheckedIds;
 },
 //设置选中的ids,e表示table的id,obj表示选中的行数据，v表示记录哪一个参数
 d.setLayuiPageCheckedIds=function (e,obj,v) {
  var a = c.config[e];
  var layuiPageCheckedIds = a.layuiPageCheckedIds;
  //全选按钮
  if(obj.type == "all"){
   //全选
   if (obj.checked) {
    var checkStatus = d.checkStatus(e);
    var datas = checkStatus.data;
    for(var i = 0; i < datas.length; i++) {
     layuiPageCheckedIds = d.setPageSelected(layuiPageCheckedIds, datas[i][v]);
    }
   } 
 //取消全选
 else {
    var cache = d.cache;
    var datas = cache[e];
    for(var i = 0; i < datas.length; i++) {
     layuiPageCheckedIds = d.cancelPageSelected(layuiPageCheckedIds, datas[i][v]);
    }
   }
  }
 //单行选中
 else {
 //选中
   if (obj.checked) {
    layuiPageCheckedIds = d.setPageSelected(layuiPageCheckedIds, obj.data[v]);
   }
 //取消选中
 else {
    layuiPageCheckedIds = d.cancelPageSelected(layuiPageCheckedIds, obj.data[v]);
   }
  }
  a.layuiPageCheckedIds = layuiPageCheckedIds;
 },
 //添加选中项
 d.setPageSelected=function(layuiPageCheckedIds, seleted){
  if(layuiPageCheckedIds == undefined || layuiPageCheckedIds == ""){
    return "," + seleted + ",";
   }else{
    return layuiPageCheckedIds + seleted + ",";
   }
 },
 //取消选中项
 d.cancelPageSelected=function (layuiPageCheckedIds, seleted) {
  var match = "," + seleted + ",";
  var pos = layuiPageCheckedIds.indexOf(match);
  if (pos >= 0) {
   return layuiPageCheckedIds.substring(0, pos) + layuiPageCheckedIds.substring(pos + match.length - 1);
  }
 }
});