简单实现一个vue路由守卫router.beforeEach通过获取sessionStorage下的token完成登陆跳转此功能，与后端没有交互

先上代码，效果在最后呈上

1.在views里新建一个文件名叫login.vue的文件：

2. 在login文件中引入要用的登陆组件：

<template>
  <div>
    <div :style="background" class="bgBackground"></div>
    <div class="forms">
      <div class="content">
        <el-form
          :model="ruleForm"
          status-icon
          :rules="rules"
          ref="ruleForm"
          label-width="100px"
          class="demo-ruleForm"
        >
          <el-form-item label="用户名" prop="pass">
            <el-input
              type="password"
              v-model="ruleForm.pass"
              autocomplete="off"
            ></el-input>
          </el-form-item>
          <el-form-item label="密码" prop="checkPass">
            <el-input
              type="password"
              v-model="ruleForm.checkPass"
              autocomplete="off"
            ></el-input>
          </el-form-item>
          <el-form-item label="真实姓名" prop="name">
            <el-input v-model.number="ruleForm.name"></el-input>
          </el-form-item>
          <el-form-item>
            <el-bu