vue实现路由监听和参数监听

routerAction(hideDisplays, data) {
  switch (hideDisplays) {
    case "pubAccountMenu":
      this.$router.push({
        name: "AppAccountInfo",
      });
    break;
    //在菜单路由上存储各种需要信息
    case "publicDocInfoMenu": //菜单code: publicDocInfoMenu
      data.instanceInfo.active = 4 //标记已点击的标签页
      data.instanceInfo.fromMenu = true
      data.instanceInfo.editOrAdd = false;
      this.getUcMenuInfo(data.instanceInfo) //数据、对象等
      this.$router.push({
        name: "DocumentInfoMaint",
        params: {
          instanceInfo: data.instanceInfo,
          uuid: data.uuid,
          breadCrumb: data.instanceInfo.name,
          breadCrumbEn: En_Name,
          prefix: 'text.breadCrumb.MyUseCase', //面包屑信息
          prefixPath: '/MyApplications',
          breadPath: '/AppInfo/' + data.uuid,
          routeName:'AppInfo',
          prefixRouteName:'MyApplications',
          firstRoute:true
        }
      });
    break;
  }
}

watch: {
 $route: function (to, from) {

  if (this.$route.params.instanceInfo) {
   // let data = JSON.parse(this.$route.params.instanceInfo);
   let isObject = this.$route.params.instanceInfo; //获取路由传过来的数据
   //判断数据是否为对象，如果不是，则解析并获取数据
   let data = isObject instanceof Object ? this.$route.params.instanceInfo : JSON.parse(this.$route.params.instanceInfo);
   this.currentProductId = data.uuid;
   this.solutionUuid = data.uuid;
   this.setValue(data)
   localStorage.setItem('SolutionInfo', JSON.stringify(data));
  } else if (localStorage.getItem("SolutionInfo")) {//在浏览器的本地存储中获取数据
   //一般数据在浏览器的本地存储中会以JOSN字符串的方式存储，所以要把数据转换成JSON对象来使用
   let data = JSON.parse(localStorage.getItem("SolutionInfo"));
   this.currentProductId = data.uuid;
   this.solutionUuid = data.uuid;
   this.setValue(data)
  }

 }
}

页面A：
  //定义要监听的对象
  <vm-register-table :param="param" :child-open-table="jumpOrDialog" />

  例如监听param：
  (1).若param为对象，则需要把它转换成JSON字符串
  let tenantParam = {
    tenantId:tenantId,
    isTerminals: this.jumpOrDialog.isTerminals
  }
  this.param = JSON.stringify(tenantParam);
  (2).若param为字符串，则不用做任何转换
  this.param = currentPage;

页面B：
  //1.注册监听对象
  props: ['childOpenTable','param'],
  
  //2.监听
  (1).
  watch:{
    param:function(oldValue){
      console.log("newValue++"+oldValue)
      let jumpOrDialog = JSON.parse(oldValue)
      console.log("jumpOrDialog==++"+jumpOrDialog)
      let isTerminal = jumpOrDialog.isTerminals 
      if(isTerminal){
        this.tenantId = jumpOrDialog.tenantId;
      }else{
        let userInfo = JSON.parse(localStorage.getItem("userInfo"))
        this.tenantId = userInfo.tenantId;
      }
      let vmData = {
        tenantId: this.tenantId,
        pageNum: this.pageNum,
        pageSize: this.pageSize
      }
      this.getAllVmRegister(vmData); 
    }
  },  
  (2).
  watch:{
     param:function(oldValue){
       let pages = JSON.parse(oldValue)
       this.currentPage = pages;
     }
   }