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文档中说 375的设计稿，要在DEVICE_RATIO赋值 2 / 1 ，但实际设置 2 / 1 后，会显示为预期1/4大小，而设置为 1 / 2后，正常显示了 另外 Taro. pxTransform 似乎并不会使用 designWidth 和 deviceRatio 的设置