element的select控制输入格式

<el-select
                  v-model="formList[0].value"
                  filterable
                  allow-create
                  placeholder="请输入内容"
                  @focus="dropDownInformation(formList[0].name)"
                  @input.native="filterData"
                  ref="searchSelect"
                >
                  <el-option
                    v-for="item in temporaryOptions"
                    :key="item.index"
                    :label="item"
                    :value="item"
                  >
                  </el-option>
                </el-select>

 // 限制输入字数
    filterData() {
      let str = this.$refs.searchSelect.$data.selectedLabel;
      // str = str.replace(/^([^\u4e00-\u9fa5]|[^a-zA-Z0-9]){6,}$|\s+/g, "不能输入超过60字符");
       str = str.replace(/^([^\u4e00-\u9fa5]|[^a-zA-Z0-9]){6,}$|\s+/g, "");
    },