add isError and isSuccess method

RuoYi

2022-09-12 07dda8f5d6315e5c373ac04ee32a97ea61f941d1

 src/main/java/com/ruoyi/framework/web/domain/R.java

@@ -102,4 +102,14 @@
    {
        this.data = data;
    }

    public Boolean isError()
    {
        return !isSuccess();
    }

    public Boolean isSuccess()
    {
        return R.SUCCESS == getCode();
    }
}