element-ui设置下拉选择切换必填和非必填

 1、<el-form-item label="区域" prop="areaCode" :required="isHaveTo"><el-select v-model="form.areaCode" placeholder="请选择区域" clearable size="small"><el-option v-for="dict in jobGroupOptions" :key="dict.dictValue" :label="dict.dictLabel" :value="dict.dictValue" /></el-select></el-form-item>2、data() {let validateName = (rule, value, callback) => {alert(value)if (value === undefined && this.isHaveTo) {callback(new Error("请选择区域"));} else {callback();}};return {isShow:true,rules: {3、 areaCode: [{ validator: validateName }],roleName: [{ required: true, message: "角色名称不能为空", trigger: "blur" }],created() {this.getList();this.getDicts("sys_normal_di