完善数字增减框的交互功能设计，修复TaroUI数字框的输入问题

Tevin

2022-03-14 9cda914242234dd0673a31c6f5dc7a90aa4ad1f1

 forms/numberStep/cNumberStep.scss

@@ -48,5 +48,12 @@
                color: #999;
            }
        }
        &.not-dirty {
            .at-input-number {
                input {
                    color: transparent;
                }
            }
        }
    }
}