我们通过 getImageData 获得具体的像素点的数据，不过还需要转换一下才能变成可用的数据。

getColor = () => { const { centerX, centerY } = this.centerPoint const { data } = this.imageCtx.getImageData(centerX, centerY, 1, 1) const color = transform2rgba(data) } const transform2rgba = (arr) => { arr[3] = parseFloat(arr[3] / 255) return `rgba(${arr.join(', ')})` }

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CanvasReact

Using the image to perform an action instead of the button in the iPhone application Issues #28 Dec 11, 2017

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