在你登录的时候，获取到弱密码，然后将他存到vuex里面，在登录进去之后，index页面再去取，思路是这样的

一、vuex里面定义密码字段

我是直接在user.js里面写的

import { login, logout, getInfo } from '@/api/login'
import { getToken, setToken, removeToken } from '@/utils/auth'

const user = {
  state: {
    passwordY: ''
  },

  mutations: {

    SET_PASSWORD: (state, passwordY) => {
      state.passwordY = passwordY
    },
  },

  actions: {
    Cun_PASSWORD({ commit },name){
      commit('SET_PASSWORD',name)
    },
  
  }
}

export default user

 也可以新建一个哈都一样

二、登录的时候存输入的密码

利用this.$store.dispatch去存，Cun_PASSWORD这个就是我actions里面的方法，this.loginForm.password就是存入的密码

this.$store.dispatch('Cun_PASSWORD', this.loginForm.password)

 三、首页取密码并且做验证

在mouted里面是可以获取到存储到vuex里的密码this.$store.state.user.passwordY（user是我刚刚放到user.js里面了，根据你写的变哈）

  mounted() {

    this.mima(this.$store.state.user.passwordY)
   }

methods里面写验证方法 

  methods: {
    mima(value){
      if(!/[0-9]/.test(value)) {
        this.$refs.passwordModal.open()
      } else if (!/[a-z]/.test(value) || !/[A-Z]/.test(value)) {
        this.$refs.passwordModal.open()
      } else if (!/[^0-9a-zA-Z]/.test(value)) {
        this.$refs.passwordModal.open()
      } else if (value.length < 8 || value.length > 50) {
        this.$refs.passwordModal.open()
      }
    },
 },

 如果是不符合密码规则，就弹出来，下面是弹出层组件

四、弹出层组件

<template>
    <el-dialog
      title="密码过期请修改密码"
      :visible.sync="dialogVisible"
      :close-on-click-modal="false"
      :close-on-press-escape="false"
    >
      <el-form :model="passwordForm" :rules="rules" ref="passwordFormRef" label-width="100px">
        <el-form-item label="旧密码" prop="oldPassword">
          <el-input type="password" v-model="passwordForm.oldPassword" autocomplete="off"  show-password></el-input>
        </el-form-item>
        <el-form-item label="新密码" prop="newPassword">
          <el-input type="password" v-model="passwordForm.newPassword" autocomplete="off"  show-password></el-input>
        </el-form-item>
        <el-form-item label="确认密码" prop="confirmPassword">
          <el-input type="password" v-model="passwordForm.confirmPassword" autocomplete="off"  show-password></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button type="primary" @click="confirmPassword">确 定</el-button>
      </span>
    </el-dialog>
  </template>
  
  <script>
  export default {
    data() {
      return {
        dialogVisible: false,
        passwordForm: {
          oldPassword: '',
          newPassword: '',
          confirmPassword: ''
        },
        rules: {
          oldPassword: [
            { required: true, message: '请输入旧密码', trigger: 'blur' }
          ],
          newPassword: [
            { required: true, message: "新密码不能为空", trigger: "blur" },
            { min: 8, max: 20, message: "长度在 8 到 20 个字符", trigger: "blur" },
            { validator: this.equalToOldPassword, trigger: "blur" },
            {
              validator: (rule, value, callback) => {
                const regexPattern = /^(?![a-zA-Z]+$)(?![A-Z0-9]+$)(?![A-Z\W_!@#$%^&*`~()-+=]+$)(?![a-z0-9]+$)(?![a-z\W_!@#$%^&*`~()-+=]+$)(?![0-9\W_!@#$%^&*`~()-+=]+$)[a-zA-Z0-9\W_!@#$%^&*`~()-+=]*$/;             
       if (!regexPattern.test(value)) {
                  callback(new Error("密码至少包含三种字符类型：小写字母、大写字母、数字和特殊字符"));
                } else {
                  callback(); // 这里调用callback来表示验证通过
                }
              },
              trigger: "blur"
            }
          ],
          confirmPassword: [
            { required: true, message: '请确认新密码', trigger: 'blur' },
            { validator: this.validateConfirmPassword, trigger: 'blur' }
          ]
        }
      };
    },
    methods: {
      validateConfirmPassword(rule, value, callback) {
        if (value !== this.passwordForm.newPassword) {
          callback(new Error('两次输入密码不一致!'));
        } else {
          callback();
        }
      },
      equalToOldPassword (rule, value, callback)  {
        if (this.passwordForm.oldPassword == value) {
          callback(new Error("禁止重复使用上次旧密码"));
        } else {
          callback();
        }
      },
      confirmPassword() {
        // 验证表单
        this.$refs.passwordFormRef.validate((valid) => {
          if (valid) {
            // 调用修改密码的方法
            this.$parent.updatePassword(this.passwordForm)
        
          }
        });
      },
      open() {
        this.dialogVisible = true; // 假设你使用了Element UI的Dialog组件
      },
    }
  };
  </script>
  
  <style scoped>
  ::v-deep .el-dialog__headerbtn {
    display: none !important; /* 使用 !important 确保样式覆盖 */
  }
  </style>

在index里引用

  <PasswordModal ref="passwordModal" />

import PasswordModal from "@/components/PasswordModal/index.vue";
  components: {
    PasswordModal
  },

index里面加一个改密码的方法 

methods: {
    mima(value){
      if (value === "") {
        this.$message.warning("请输入密码");
      } else if (!/[0-9]/.test(value)) {
        this.$refs.passwordModal.open()
      } else if (!/[a-z]/.test(value) || !/[A-Z]/.test(value)) {
        this.$refs.passwordModal.open()
      } else if (!/[^0-9a-zA-Z]/.test(value)) {
        this.$refs.passwordModal.open()
      } else if (value.length < 8 || value.length > 50) {
        this.$refs.passwordModal.open()
      }
    },
    updatePassword(passwordForm) {
//这个接口是你自己修改密码的接口！记得改
      updateUserPwd(passwordForm.oldPassword, passwordForm.newPassword).then(
        (response) => {
          this.$modal.msgSuccess("修改成功");
          this.$store.dispatch('LogOut').then(() => {
            location.href = '/index'
          })
        }
      );
    },methods: {
    mima(value){
      if (value === "") {
        this.$message.warning("请输入密码");
      } else if (!/[0-9]/.test(value)) {
        this.$refs.passwordModal.open()
      } else if (!/[a-z]/.test(value) || !/[A-Z]/.test(value)) {
        this.$refs.passwordModal.open()
      } else if (!/[^0-9a-zA-Z]/.test(value)) {
        this.$refs.passwordModal.open()
      } else if (value.length < 8 || value.length > 50) {
        this.$refs.passwordModal.open()
      }
    },
    updatePassword(passwordForm) {
      updateUserPwd(passwordForm.oldPassword, passwordForm.newPassword).then(
        (response) => {
          this.$modal.msgSuccess("修改成功");
          this.$store.dispatch('LogOut').then(() => {
            location.href = '/index'
          })
        }
      );
    },