数值步长输入组件，修复空值时显示异常的问题

Tevin

2022-01-21 eb514affa9174c7f931b3e71435e7ee819e2d4d0

 forms/numberStep/cNumberStep.scss

@@ -20,13 +20,20 @@
    }
    .c-number-step-step {
        .at-input-number {
            .weui-input {
                display: inline-block;
            }
            .at-input-number__btn {
                padding: 16px 16px;
                width: 30px;
                width: 36px;
                height: 30px;
            }
            .at-input-number__input {
                font-size: 30px;
                font-size: 36px;
            }
            .at-input-number__btn-subtract,
            .at-input-number__btn-add {
                font-size: 36px;
            }
        }
        &.on-unit {
@@ -41,5 +48,12 @@
                color: #999;
            }
        }
        &.on-empty {
            .at-input-number {
                input {
                    color: transparent;
                }
            }
        }
    }
}