数组（[]）类型验证

•  { }占位符，对应columns里面title

    "childArray": [
      {
        "type": "childArray",
        "field": "childArray",
        "message": "值必须是数组类型。",
        "sortId": 4,
        "isAdd": true,
        "isEdit": true
      }
    ],

 case RuleType.Array:
                        if (!(valueTemp is JArray && valueTemp != null && (valueTemp as JArray).Count() > 0))
                        {
                            throw new BizException(string.Format(message, rule.Min, rule.Max, rule.Accept));
                        }