通过JS解码UTF-8图像(字符串)

function decodeUTF8Image(utf8ImageString) {
  const byteArray = Array.from(utf8ImageString).map(char => char.codePointAt(0));
  
  let decodedString = "";
  let i = 0;
  while (i < byteArray.length) {
    const byte = byteArray[i];
    
    if (byte < 0x80) {
      decodedString += String.fromCharCode(byte);
      i++;
    } else if (byte < 0xE0) {
      const byte2 = byteArray[i + 1];
      const codePoint = ((byte & 0x1F) << 6) | (byte2 & 0x3F);
      decodedString += String.fromCharCode(codePoint);
      i += 2;
    } else if (byte < 0xF0) {
      const byte2 = byteArray[i + 1];
      const byte3 = byteArray[i + 2];
      const codePoint = ((byte & 0x0F) << 12) | ((byte2 & 0x3F) << 6) | (byte3 & 0x3F);
      decodedString += String.fromCharCode(codePoint);
      i += 3;
    } else {
      // Handle other cases if needed
    }
  }
  
  return decodedString;
}

const utf8ImageString = "图片字符串";
const decodedImage = decodeUTF8Image(utf8ImageString);
console.log(decodedImage);