Detailed tutorial on how to convert color decimal to rgba format using JS

This article mainly introduces the method of JS to convert decimal color into rgba format, involving the relevant operation skills of javascript for color numerical conversion. Friends in need can refer to the following

Examples of this article Developed a JS method to convert the decimal color into rgba format. Share it with everyone for your reference, the details are as follows:

When we know an integer such as (a color value between 0~256x256x256x256), and want to obtain its 3 primary colors plus a transparency, that is, alpha, red, green, blue, you can use the following methods:

Method one:

##

function getColor(number) {
  let color = number;
  const blue = parseInt(color % 0x100, 10);
  color = color >>> 8;
  const green = parseInt(color % 0x100, 10);
  color = color >>> 8;
  const red = parseInt(color % 0x100, 10);
  const alpha = (parseInt(color >>> 8, 10) / 0xFF).toFixed(1);
  return `rgba(${red}, ${green}, ${blue}, ${alpha})`;
}

Method two:

function getColor(number) {
  const alpha = number >> 24 & 0xff;
  const red = number >> 16 & 0xff;
  const green = number >> 8 & 0xff;
  const blue = number & 0xff;
  return `rgba(${red}, ${green}, ${blue}, ${alpha})`;
}

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