el-form动态表单验证项

template代码：

<el-form-item 
            label="目标用户及数据需求描述" 
            class="project-desc project-targetUser" 
            prop="targetUser" 
            :rules="targetRequired ? addFormRules.targetUser : addFormRules.targetUserFalse"
          >

通过:rules来控制启用哪个校验规则

script代码：

targetUser: [
          { required: true, message: '请输入目标用户及数据需求描述', trigger: 'blur' }
        ],
        targetUserFalse: [
          { required: false, message: '请输入目标用户及数据需求描述', trigger: 'blur' }
        ],