修改页面，完成单页模式新增首页返回上一页按钮

dist/public/js/lay-module/mods/mods.js

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+(function(o,e){typeof o.layui=="object"&&layui.define&&layui.define(function(a){a("mods",e(layui))})})(this,function(o){"use strict";var e={jsanNotice:"mods/extend/jsan-notice"},a=function(r,f){var i={};if(typeof r=="string"){if(!l(r)){if(typeof e[r]!="string")throw new Error("引入的插件"+r+"不在预定义列表中");i[r]=e[r]}}else if(Array.isArray(r)){for(var s=0,t;t=r[s++];)if(!l(t)){if(typeof e[t]!="string")throw new Error("引入的插件"+t+"不在预定义列表中");i[t]=e[t]}}else throw new Error("mods()中，传入了无效的参数");if(typeof f!="function")throw Error("第二个参数必须是函数");o.extend(i).use(r,function(){for(var n=[],c=0,y;y=arguments[c++];)n.push(y);f.apply(o,n)})},l=function(r){return typeof u[r]=="string"};typeof Array.isArray!="function"&&(Array.isArray=function(r){return Object.prototype.toString.call(r)==="[object Array]"});var u={layer:"layer",laydate:"laydate",layedit:"layedit",laypage:"laypage",laytpl:"laytpl",table:"table",form:"form",upload:"upload",jquery:"jquery",code:"code",carousel:"carousel",element:"element",flow:"flow",mobile:"mobile",rate:"rate",tree:"tree",util:"util"};return a});