如下为el-form加入rules检验【:rules="userInfoFormRules"】

规则定义如下：

export default {
  data() {
    return {
userInfoFormRules: {
        username: [
          { required: true, message: "请输入用户名", trigger: "blur" }
        ],
        realname: [{ required: true, message: "请输入姓名", trigger: "blur" }],
        password: [{ required: true, message: "请输入密码", trigger: "blur" }],
        mobile: [
          {
            required: true,
            message: "请输入手机号码",
            trigger: "blur"
          },
          {
            validator: function(rule, value, callback) {
              if (/^1[34578]\d{9}$/.test(value) == false) {
                callback(new Error("手机号格式错误"));
              } else {
                callback();
              }
            },
            trigger: "blur"
          }
        ],
        email: [
          {
            required: true,
            message: "请输入邮箱",
            trigger: "blur"
          },
          {
            validator: function(rule, value, callback) {
              if (
                /^\w{1,64}@[a-z0-9\-]{1,256}(\.[a-z]{2,6}){1,2}$/i.test(
                  value
                ) == false
              ) {
                callback(new Error("邮箱格式错误"));
              } else {
                callback();
              }
            },
            trigger: "blur"
          }
        ]
      },
      
    };
  }
}

也可以从外部引入校验规则，参考：vue---表单校验-rules外部引入自定义校验(validator)