mint ui必填下拉验证

//js控制不了时就写在行内控制<el-form-item label="教师姓名" prop="UserId" :rules="[{ required: true, message: '班级不能为空'}]" class="el-select-class"><el-select v-model="newClassForm.UserId" placeholder="请选择教师姓名"><el-option v-for="item in selectTeachers" :key="item.UserId" :label="item.RealName" :value="item.UserId"></el-option></el-select></el-form-item>//新建班级页面验证newClassFormRules:{Name: [{ required: true, message: '请输入班级名称', trigger: 'blur' }], ClassType: [{ required: true, message: '请输入年级名称', trigger: 'change' }], UserId: [{ required: true, message: '请输入教师姓名', trigger: 'change' }] }