1.表单需加上ref属性
2.字段需加上prop属性
elementplus表单链接
实际使用

1. 加上ref=“ruleFormRef” 和prop=“userId”

 <el-form :model="ruleForm" label-width="120px" ref="ruleFormRef" :rules="rules">
            <el-form-item label="账号:" prop="userId">
              <el-input v-model="ruleForm.userId" placeholder="请输入您的邮箱" />
            </el-form-item>
                 </el-form-item>
          </el-form>


//字段赋值
 const ruleForm = reactive({
  userId: ""
});

2.给重置按钮写上@click

  <el-button @click="resetForm(ruleFormRef)">重填</el-button>

3.编写@click事件

const resetForm = (ruleForm: FormInstance | undefined) => {
  if (!ruleForm) return;
  ruleForm.resetFields();
};