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这个 PR 做了什么? (简要描述所做更改)
showModal 模态框加上类名,和 2.x 保持一致。在 H5 端用户可能会通过类名来修改模态框样式
这个 PR 是什么类型? (至少选择一个)
这个 PR 涉及以下平台: