VUE Element-UI 用戶修改和重置密碼時，新密碼和密碼確認失去焦點的時候不一致的校驗

<el-dialog title="修改密碼" :visible.sync="dialogTableVisible" :fullscreen="true" :show-close="false" 
    :close-on-click-modal="false"  >
     <el-form ref="form"  label-width="80px" :rules="rules" :model="user">
    <el-form-item label="新密碼" prop="newPassword">
      <el-input v-model="user.newPassword" placeholder="請輸入新密碼" type="password" />
    </el-form-item>
    <el-form-item label="確認密碼" prop="confirmPassword">
      <el-input v-model="user.confirmPassword"  placeholder="請確認密碼" type="password" />
    </el-form-item>
    <el-form-item>
      <el-button type="primary" size="mini" @click="modifyPwd">保存</el-button>
    </el-form-item>
  </el-form>
   </el-dialog>

 data() {
      const equalToPassword = (rule, value, callback) => {
      if (this.user.newPassword !== value) {
        callback(new Error("兩次輸入的密碼不一致"));
      } else {
        callback();
      }
    };
    return {
      // 版本號
      version: "3.2.1",
      dialogTableVisible: false,
      currentUser:{},
      currentUserId:undefined,
      user: {
        newPassword: undefined,
        confirmPassword: undefined
      },

  // 表單校驗
      rules: {
        newPassword: [
          { required: true, message: "新密碼不能為空", trigger: "blur" },
          { min: 8, max: 12, message: "長度在 8 到 12個字符", trigger: "blur" }
        ],
        confirmPassword: [
          { required: true, message: "確認密碼不能為空", trigger: "blur" },
          { required: true, validator: equalToPassword, trigger: "blur" }
        ]
      }