如何快速读取源数组中的子数组

Question

我目前使用以下内容：

ExampleWrapper

但这似乎有些迟钝。有什么方法可以通过缓冲区数组中的一次读取来创建新的const canvasOneBuffer = new Uint8Array(canvasOneImageData.data.buffer); // within an x/y loop: const newPixel1Data0 = canvasOneBuffer[4 * (x + y * canvasOne.width) + 0]; const newPixel1Data1 = canvasOneBuffer[4 * (x + y * canvasOne.width) + 1]; const newPixel1Data2 = canvasOneBuffer[4 * (x + y * canvasOne.width) + 2]; const newPixel1Data3 = canvasOneBuffer[4 * (x + y * canvasOne.width) + 3]; const pixel1Data = new Uint8ClampedArray(4); pixel1Data[0] = newPixel1Data0; pixel1Data[1] = newPixel1Data1; pixel1Data[2] = newPixel1Data2; pixel1Data[3] = newPixel1Data3; 吗？

Answer 1

你的意思是

const pixel1Data = canvasOneBuffer.slice(0, 4)
.map(canvasItem => {
  // do what ever with canvasItem
});