1、html部分

<template>
 <div>
  <el-form ref="formRef" label-width="100px" :model="state.dialogForm" :rules="rules">
     <el-form-item prop="oldPassword" label="旧密码">
        <el-input v-model="state.dialogForm.oldPassword" size="large" type="password" clearable />
     </el-form-item>
     <el-form-item prop="password" label="新密码">
       <el-input v-model="state.dialogForm.password" size="large" type="password" clearable />
     </el-form-item>
     <el-form-item prop="checkPassword" label="确认密码">
        <el-input v-model="state.dialogForm.checkPassword" size="large" type="password" clearable />
      </el-form-item>
      <el-form-item>
        <div>密码为6-18字母和数字组合</div>
      </el-form-item>
	</el-form>
	 <el-form-item>
		<el-button @click="close(formRef)">取消</el-button>
		<el-button type="primary" :loading="loading" @click="onSubmit(formRef)">确认</el-button>
	</el-form-item>
</div>
</template>

2、ts部分

<script setup lang="ts">
import { reactive, ref, onMounted } from 'vue'
import type { FormInstance, FormRules } from 'element-plus'
const formRef = ref<FormInstance>(); // form表单dom
// 检验确认密码框
const validateCheckPassword = (rule, value, callback) => {
  if (value === "") {
    callback(new Error("确认密码不能为空"));
  } else if (state.dialogForm.password !== value && state.dialogForm.password !== '') {
    callback(new Error("两次密码不一致!"));
  } else {
    callback();
  }
}
// 检验新密码框
const validatePassword = (rule, value, callback) => {
  var pwdRegex = new RegExp(/^(?![0-9]+$)(?![a-zA-Z]+$)[0-9A-Za-z]{6,18}$/);
  if (value === "") {
    callback(new Error("新密码不能为空"));
  } else if (!pwdRegex.test(value)) {
    callback(new Error("密码必须为6-18位字母和数字组合"));
  } else if (state.dialogForm.oldPassword === value && state.dialogForm.oldPassword !== '') {
    callback(new Error("新密码不能与旧密码相同"));
  }else {
    callback();
  }
}
const rules = reactive<FormRules>({
  oldPassword: [
    { required: true, message: '旧密码不能为空', trigger: 'blur' },
  ],
  password: [
    { required: true, validator: validatePassword, trigger: 'blur' },
  ],
  checkPassword:  [
    { required: true, validator: validateCheckPassword, trigger: 'blur' },
  ],
})
const state = reactive({
  dialogForm: { // 忘记密码表单
    oldPassword: '', // 旧密码
    password: '', // 新密码
    checkPassword: '' // 确认密码
  },
});
onMounted(() => {
})

/** 取消按钮 */
const close = (formEl: FormInstance | undefined) => {
  if (!formEl) return
  formEl.resetFields() // 清除校验
}
/** 确认按钮 */
const onSubmit = async (formEl: FormInstance | undefined) => {
  loading.value = true;
  if (!formEl) return
  await formEl.validate((valid, fields) => {
    if (valid) {
       state.dialogVisible = false // 关闭弹窗  
    } else {
      return fields;
    }
  })
}
</script>