方法默认初始值

1.点击搜索按钮的时候如果返回的数据为空，则提示弹框
2.搜索按钮与导航切换用的是同一方法
3.bug是点击导航切换如果没有数据的话也显示弹框
4.解决办法为：在html里给导航切换的方法一个默认值
5.在方法里如果有那个默认值，就清空数据

html
 <el-menu :default-active="activeIndex" class="el-menu-demo" mode="horizontal"
                   @select="handleSelect($event,1)" active-text-color="#3ca0ff">
            <el-menu-item index="2">待审核<span>({{numObject.audit}})</span></el-menu-item>
            <el-menu-item index="1">审核通过<span>({{numObject. passed}})</span></el-menu-item>
            <el-menu-item index="3">未审核通过<span>({{numObject.fail}})</span></el-menu-item>
            <el-menu-item index="0">草稿箱<span>({{numObject.draft}})</span></el-menu-item>
</el-menu>
js

    // 获取需求列表接口
        handleSelect(key = null,s = null){
          if(key) {
            this.navname = +key
          }
          if(s===1) {
            this.searchName = ''
          }
          if(this.navname === 2){
            this.currentPage = this.totalCounts2.page
          }else if(this.navname === 1){
            this.currentPage = this.totalCounts1.page
          }else if(this.navname === 3){
            this.currentPage = this.totalCounts3.page
          }else if(this.navname === 0){
            this.currentPage = this.totalCounts0.page
          }
          let paramObj = {
            "status":this.navname,
            "page":this.currentPage,
            "pageSize":this.pagesize,
            "timestamp": new Date().getTime(),
          }
          // 是否有搜索内容
          if(this.searchName !== '') {
            paramObj.keywords = this.searchName
          }
          this.$api.post(
            '/IPOSys/api/demand/getDemandList',
            {
              "content":this.getSign(paramObj)
            },
            res=>{
              console.log(res)
              console.log('获取需求列表接口')
              if(this.searchName !== '' && res.demandList.length === 0){
                this.$message('暂无搜索内容')
              }
              this.tableData = res.demandList
              this.getNum()
              if(this.navname === 2){
                this.totalCounts2.pageTotal = res.pageUtil.pageTotal
                this.numObject.audit = res.PageUtil.pageTotal
              }else if(this.navname === 1){
                this.totalCounts1.pageTotal = res.pageUtil.pageTotal
                this.numObject.passed = res.PageUtil.pageTotal
              }else if(this.navname === 3){
                this.totalCounts3.pageTotal = res.pageUtil.pageTotal
                this.numObject.fail = res.PageUtil.pageTotal
              }else if(this.navname === 0){
                this.totalCounts0.pageTotal = res.pageUtil.pageTotal
                this.numObject.draft = res.PageUtil.pageTotal
              }
            }
          )
        },