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https://gitee.com/zhangbingce/docs/pulls/18524由 zhangbingce 提交于
[canvas]canvasrenderingcontext2d和offscreencanvasrenderingcontext2d构造中RenderingContextSettings非必填 Signed-off-by: Nzhangbingce <zhangbingce@huawei.com> Change-Id: I2c73ac518c4d2a9e7e7cc92d5e2a8d5c013f43e11c471c31