如何将RGB字符串转换为十六进制字符串

function rgbToHex(rgbString) {
  // 提取颜色通道值
  var rgbValues = rgbString.replace(/^(rgb|rgba)\(/, '').replace(/\)$/, '').split(',');
  var red = parseInt(rgbValues[0].trim());
  var green = parseInt(rgbValues[1].trim());
  var blue = parseInt(rgbValues[2].trim());

  // 转换为十六进制表示
  var hexRed = red.toString(16).padStart(2, '0').toUpperCase();
  var hexGreen = green.toString(16).padStart(2, '0').toUpperCase();
  var hexBlue = blue.toString(16).padStart(2, '0').toUpperCase();

  // 拼接颜色通道的十六进制表示
  var hexString = hexRed + hexGreen + hexBlue;

  return hexString;
}

// 示例用法
var rgbString = "rgb(255, 0, 127)";
var hexString = rgbToHex(rgbString);
console.log(hexString); // 输出 "FF007F"