标签加上ref实例名称

 <el-input
          ref="input"
          v-model="searchData.name"
          placeholder="请输入搜索内容"
          suffix-icon="el-icon-search"
        />

获取焦点

 this.$nextTick(() => {
        this.$refs.input.focus()
      })

失去焦点

 this.$nextTick(() => {
        this.$refs.input.blur()
      })