<keep-alive>
   <router-view v-if="$route.meta.keepAlive" class="app-middle-content"/>
  </keep-alive>
  <router-view v-if="!$route.meta.keepAlive" class="app-middle-content"/>

// 定义一个混入对象
let paramsMemoryMixin = {
 data () {
  return {
   // 记住参数存储的key, 请在引用该mixin的组件中重写
   memoryParamsKey: 'nb-memory-params'
  }
 },
 created: function () {
  this.initParams();
  // 在页面刷新时将筛选信息保存到sessionStorage里
  window.addEventListener('beforeunload', this.onPageUnload);
 },
 methods: {
  initParams () {
   let userParams = JSON.parse(sessionStorage.getItem(this.memoryParamsKey));

   for (let key in userParams) {
    this[key] = userParams[key];
   }
  },
  onPageUnload () {
   sessionStorage.setItem(this.memoryParamsKey, JSON.stringify(this.getMemoryParams()));
  },

  /**
   * 需要记住的页面参数
   * @return { key: value }
   */
  getMemoryParams () {
   throw Error('请重写paramsMemoryMixin的getMemoryParams方法');
  }
 },

 beforeDestroy () {
  window.removeEventListener('beforeunload', this.onPageUnload);
 },

 beforeRouteLeave (to, from, next) {
  this.onPageUnload();
  next();
 }
};

export default paramsMemoryMixin;

import memoryMixin from '文件路径/params-memory-mixin.js';

export default {
 mixins: [ memoryMixin ],
 data () {
  return {
   // 记住参数存储的key
   memoryParamsKey: 'xx-xx-params'
  }
 },
 methods: {
  getMemoryParams () {
   return {
    key1: this.value1,
    key2: this.value2,
    key3: this.value3
   };
  }
 }
}