思路：鎖屏的思路從登錄開始在登錄的時候拿到密碼使用md5對密碼加密，然后存到vuex或者瀏覽器本地存儲，然后新建鎖屏頁面，如下圖。在鎖屏頁面輸入密碼對鎖屏頁面輸入的密碼進行MD5加密，加密后把登錄的時候存到本地存儲的密碼對比。兩個密碼一樣的話就成功了可以跳到首頁，反之則密碼錯誤，仍然在鎖屏頁面。

上面圖片為對登錄的密碼進行md5加密

附：md5加密方法

安裝插件 js-md5
npm install js-md5 -S
使用

一、全局掛載

第一步在main.js中引入md5，并掛載到vue的原型上
import md5 from 'js-md5'
Vue.prototype.$md5 = md5
第二步使用
this.$md5('這里是需要進行md5加密的內(nèi)容')
二、局部，某個頁面使用

直接在js中引入md5，直接使用即可
import md5 from 'js-md5'
console.log(md5('這里是需要進行md5加密的內(nèi)容'))

 <div class="right-menu-item" style="cursor: pointer"  @click="lockScreen">
          <i class="el-icon-lock" style="font-weight:700;"></i>
        </div>
	  // 鎖屏：
    lockScreen() {
      this.$router.push('/screen')
    },

上面的代碼就是點擊鎖屏按鈕跳轉路由到鎖屏頁面。

1.禁止瀏覽器返回按鈕

在main.js里面加上下面的代碼

	//禁止瀏覽器上一步下一步
window.addEventListener('popstate', function() {
  history.pushState(null, null, document.URL)
 })

在 router/index.js里面加上 scrollBehavior: () => {
history.pushState(null, null, document.URL)
}這個代碼

export default new Router({
  mode: 'history', // 去掉url中的#
  // scrollBehavior: () => ({ y: 0 }),
  routes: constantRoutes,
  scrollBehavior: () => {
    history.pushState(null, null, document.URL)
  }
})

2.書寫鎖屏頁面和相關路由

下面代碼為screen/index.js 為鎖屏的頁面首先進入這個頁面默認執(zhí)行一次 unlock方法里面的localStorage.setItem(“newlockPassword”, md5(this.userForm.newPw));

把解鎖的密碼存到本都對象存儲里面，這樣路由就好做處理。

	<template>
  <div class="app">
    <el-form class="userInfo">
      <div class="body-icon">
      </div>
      <div class="title-icon">
      </div>
      <div class="box">
        <img src="../../assets/logo/logo.png" class="lock-avatar" />
      </div>
      <el-form-item>
        <el-row style="margin-left: 100px">
          <el-col :span="2">
          </el-col>
          <el-col :span="12" class="lock-nickName">{{ nickName }}</el-col>
        </el-row>
      </el-form-item>
      <el-form-item>
        <el-input
          v-model="userForm.newPw"
          placeholder="請輸入登陸密碼"
          type="password"
          auto-complete="off"
          @keyup.enter.native="unLock()"
          show-password
        >
          <div slot="prefix" style="margin-left: 3px">
            <i class="el-icon-lock"></i></div
        ></el-input>
      </el-form-item>
      <el-form-item>
        <div style="text-align: center; color: #1890ff">
          <a @click="logout">退屏重新登錄</a>
        </div>
      </el-form-item>
      <el-form-item>
        <el-button
          :loading="loading"
          size="medium"
          type="primary"
          style="width: 100%"
          @click="unLock"
          ><i class="el-icon-unlock"></i>解鎖</el-button
        >
        <!-- <el-button
          circle
          type="primary"
          plain
          icon="el-icon-unlock"
          @click="unLock"
        ></el-button> -->
      </el-form-item>
    </el-form>
  </div>
</template>

<script>
import md5 from "js-md5";
export default {
  data() {
    return {
      userForm: {
        newPw: "",
        user: "",
      },
      loading: false,
    };
  },
  methods: {
    unLock() {
      let oldAuct = localStorage.getItem("lockPassword");
      localStorage.setItem("newlockPassword", md5(this.userForm.newPw));
      console.log(oldAuct, localStorage.getItem("newlockPassword"), "999990");
      if (this.userForm.newPw === "" || this.userForm.newPw === undefined) {
        return;
      } else if (md5(this.userForm.newPw) != oldAuct) {
        this.userForm.newPw = "";
        this.$notify.error({
          title: "錯誤",
          message: "解鎖密碼錯誤，請輸入登陸密碼解鎖",
          duration: 1500,
        });
        return;
      } else {
        setTimeout(() => {
          this.$notify.success({
            title: "解鎖成功",
            duration: 1500,
          });
          this.$router.push("/index");
          this.userForm.newPw = "";
        }, 500);
      }
    },
    async logout() {
      this.$confirm("確定注銷并退出系統(tǒng)嗎？", "提示", {
        confirmButtonText: "確定",
        cancelButtonText: "取消",
        type: "warning",
      }).then(() => {
        let password = localStorage.getItem("lockPassword");
        localStorage.setItem("newlockPassword", password);
        this.$store.dispatch("LogOut").then(() => {
          location.href = "/login";
        });
      });
    },
  },
  mounted() {
    this.unLock();
  },
};
</script>

<style lang="scss" scoped>
.app {
  // background-image: url("../../assets/images/back.png");
  background-size: 100%; // 背景圖片大小最大
  height: 100%; //寬、高也最大
  width: 100%;
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-position: center;
  background-color: skyblue; //一定要設置背景顏色
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  overflow: auto;
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1500;
  .userInfo {
    // display: flex;
    background: #ffffff;
    // height: 300px;
    width: 400px;
    padding: 25px 25px 5px 25px;
    .title-icon {
      width: 120px;
      height: 20px;
      margin-bottom: 22px;
    }
    .body-icon {
      width: 500px;
      height: 120px;
      position: absolute;
      margin-left: -152px;
      margin-top: -166px;
    }
    .box {
      display: flex;
      justify-content: center;
      align-items: center;
      .lock-avatar {
        width: 100px;
        height: 100px;
        border-radius: 100px;
      
      }
    }

    .lock-nickName {
      margin-top: -2px;
      font-size: 14px;
      font-weight: 560;
      text-align: center;
    }
    .el-input {
      height: 38px;
      input {
        height: 38px;
      }
    }
  }
}
</style>

下面圖片為router/index.js 新增鎖屏路由

3.在router.beforeEach()路由首首位加上以下代碼

下面的代碼意思是對開始登錄的MD5加密密碼和 鎖屏頁面的MD5密碼 不相等并且將要去的路由不是screen 則直接跳到 screen這個頁面。

這樣的話只要點擊鎖屏按鈕進入 screen鎖屏頁面返回禁止了，路由里面輸入路由也不會生效。

	 /**
	 * 判斷鎖屏
	 */
	 //登錄的時候存的md5加密的密碼
  let oldPasswordld = localStorage.getItem("lockPassword");
  //鎖屏頁面的md5加密密碼
  let newlockPassword = localStorage.getItem("newlockPassword");
  console.log(oldPasswordld,newlockPassword)
	if (newlockPassword !== oldPasswordld && to.path !== '/screen') {
    next('/screen')
	}

4.實現(xiàn)退出鎖屏重新登錄

下面代碼在screen/index.js里面退出鎖屏重新登錄

let password = localStorage.getItem(“lockPassword”);
localStorage.setItem(“newlockPassword”, password);

注意：退出鎖屏的時候需要把本地的首次登錄的密碼賦值給鎖屏界面的密碼否則退出不了鎖屏頁面。

 <el-form-item>
        <div style="text-align: center; color: #1890ff">
          <a @click="logout">退屏重新登錄</a>
        </div>
      </el-form-item>
	 async logout() {
      this.$confirm("確定注銷并退出系統(tǒng)嗎？", "提示", {
        confirmButtonText: "確定",
        cancelButtonText: "取消",
        type: "warning",
      }).then(() => {
      //退出鎖屏的時候需要 把本地的首次登錄的密碼 賦值給鎖屏界面的密碼 否則退出不了 鎖屏頁面。然后調(diào)用vuex退出方法
        let password = localStorage.getItem("lockPassword");
        localStorage.setItem("newlockPassword", password);
        this.$store.dispatch("LogOut").then(() => {
          location.href = "/login";
        });
      });
    },