1.查看app.vue文件，这个是重点，不能忘记加（我就是忘记加了keep-alive）

<template>
	<div>
			<keep-alive>
			    <router-view v-if="$route.meta.keepAlive"></router-view>
			</keep-alive>
			<router-view v-if="!$route.meta.keepAlive"></router-view>
    </div>
</template>

2.查看router.js

      {
        path:'/loanmessage',
        component:loanmessage,
        name:'loanmessage',
        meta: {
          keepAlive: true,  //代表需要缓存
          isBack: false,
        },

3.在需要缓存的页面加入如下代码

  beforeRouteEnter(to, from, next) {
    if (from.name == 'creditInformation' || from.name == 'cityList') {
      to.meta.isBack = true;
    }
    next();
  },
  activated() {
    this.getData()
    this.$route.meta.isBack = false
    this.isFirstEnter = false

  },

附上钩子函数执行顺序：

• 不使用keep-alive
  beforeRouteEnter --> created --> mounted --> destroyed

• 使用keep-alive
  beforeRouteEnter --> created --> mounted --> activated --> deactivated
  再次进入缓存的页面，只会触发beforeRouteEnter -->activated --> deactivated 。created和mounted不会再执行。

于此文记之！！！