<template>
 <div class="login">
  <table width="100%" height="100%">
   <tr height="41"><td class="logintb" colspan="2"> </td></tr>
   <tr height="100%" class="loginbg">
    <td id="left_cont">
     <table width="100%" height="100%">
      <tr height="155"><td colspan="2"> </td></tr>
      <tr>
       <td width="20%" rowspan="2"> </td>
       <td width="60%">
        <table width="100%">
          <tr height="70"><td align="right"></td></tr>
          <tr height="274">
            <td valign="top" align="right">
              <img src="/UploadFiles/2021-04-02/logo.png">

上面的登录页面注意：login方法中登录成功需要写入sessionStorage以便路由进行判断
最主要的是路由文件中的内容：


import Vue from 'vue'
import Router from 'vue-router'
Vue.use(Router)
const routes = [
  {
    path: '/',
    redirect: '/login'
  },
  {
    path: '/login',
    name: 'login',
    component: (resolve)=>{require(['../components/Login'],resolve)}
  },
  {
    path: '/main',
    name: 'main',
    component: (resolve)=>{require(['../components/Home'],resolve)},
    redirect: 'main/info',
    children: [{
        path: 'info',
        meta: {
          id:-1
        },
        component: (resolve)=>{require(['../components/Main'],resolve)}
      }
    ]
  },
  {
    path: '/vips',
    name: 'vips',
    component: (resolve)=>{require(['../components/Home'],resolve)},
    redirect: 'vips/list',
    children: [{
        path: 'list',
        meta: {
          id:0
        },
        component: (resolve)=>{require(['../components/VipsList'],resolve)}
      },
      {
        path: 'detail',
        meta: {
          id:0
        },
        component: (resolve)=>{require(['../components/VipsDetail'],resolve)}
      },
      {
        path: 'userlog',
        meta: {
          id:0
        },
        component: (resolve)=>{require(['../components/UserLog'],resolve)}
      }
    ]
  }
];
const router = new Router({
  routes
});
/**
 * to:表示目标路由
 * from:表示来源路由
 * next:表示执行下一步操作
 */
router.beforeEach((to, from, next) => {
  if (to.path === '/login') { // 当路由为login时就直接下一步操作
    next();
  } else { // 否则就需要判断
    if(sessionStorage.username){ // 如果有用户名就进行下一步操作
     next()
    }else{
     next({path: '/login'}) // 没有用户名就跳转到login页面
    }
  }
})
export default router




目前这个只是简单的处理，这种方法官方叫做路由守卫，还有一种写法就是在meta中添加是否需要登录的控制，在beforeEach中来判断，和上面方法一样的。
希望本文所述对大家vue.js程序设计有所帮助。