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js實現(xiàn)unicode碼字符串與utf8字節(jié)數(shù)據(jù)互轉詳解

 更新時間：2019年03月21日 09:36:34   作者：追極  
這篇文章主要介紹了js實現(xiàn)unicode碼字符串與utf8字節(jié)數(shù)據(jù)互轉，文中通過示例代碼介紹的非常詳細，對大家的學習或者工作具有一定的參考學習價值，需要的朋友們下面隨著小編來一起學習學習吧

js的string變量存儲字符串使用的是unicode編碼，要保存時必須選擇其他編碼后進行傳輸，比如轉成utf-8,utf-32等。存儲到數(shù)據(jù)庫中為utf-8編碼，讀取出來如何轉換成正確的字符串就成了問題?，F(xiàn)在給出解決方案，可以正確支持中文、emoji表情、英文混合的字符串編碼互轉。

/**
 * Created by hdwang on 2019/1/28.
 */
var convertUtf8 = (function() {

  /**
   * unicode string to utf-8
   * @param text 字符串
   * @returns {*} utf-8編碼
   */
  function toBytes(text) {
    var result = [], i = 0;
    text = encodeURI(text);
    while (i < text.length) {
      var c = text.charCodeAt(i++);

      // if it is a % sign, encode the following 2 bytes as a hex value
      if (c === 37) {
        result.push(parseInt(text.substr(i, 2), 16))
        i += 2;

        // otherwise, just the actual byte
      } else {
        result.push(c)
      }
    }

    return coerceArray(result);
  }


  /**
   * utf8 byte to unicode string
   * @param utf8Bytes
   * @returns {string}
   */
  function utf8ByteToUnicodeStr(utf8Bytes){
    var unicodeStr ="";
    for (var pos = 0; pos < utf8Bytes.length;){
      var flag= utf8Bytes[pos];
      var unicode = 0 ;
      if ((flag >>>7) === 0 ) {
        unicodeStr+= String.fromCharCode(utf8Bytes[pos]);
        pos += 1;

      } else if ((flag &0xFC) === 0xFC ){
        unicode = (utf8Bytes[pos] & 0x3) << 30;
        unicode |= (utf8Bytes[pos+1] & 0x3F) << 24;
        unicode |= (utf8Bytes[pos+2] & 0x3F) << 18;
        unicode |= (utf8Bytes[pos+3] & 0x3F) << 12;
        unicode |= (utf8Bytes[pos+4] & 0x3F) << 6;
        unicode |= (utf8Bytes[pos+5] & 0x3F);
        unicodeStr+= String.fromCodePoint(unicode) ;
        pos += 6;

      }else if ((flag &0xF8) === 0xF8 ){
        unicode = (utf8Bytes[pos] & 0x7) << 24;
        unicode |= (utf8Bytes[pos+1] & 0x3F) << 18;
        unicode |= (utf8Bytes[pos+2] & 0x3F) << 12;
        unicode |= (utf8Bytes[pos+3] & 0x3F) << 6;
        unicode |= (utf8Bytes[pos+4] & 0x3F);
        unicodeStr+= String.fromCodePoint(unicode) ;
        pos += 5;

      } else if ((flag &0xF0) === 0xF0 ){
        unicode = (utf8Bytes[pos] & 0xF) << 18;
        unicode |= (utf8Bytes[pos+1] & 0x3F) << 12;
        unicode |= (utf8Bytes[pos+2] & 0x3F) << 6;
        unicode |= (utf8Bytes[pos+3] & 0x3F);
        unicodeStr+= String.fromCodePoint(unicode) ;
        pos += 4;

      } else if ((flag &0xE0) === 0xE0 ){
        unicode = (utf8Bytes[pos] & 0x1F) << 12;;
        unicode |= (utf8Bytes[pos+1] & 0x3F) << 6;
        unicode |= (utf8Bytes[pos+2] & 0x3F);
        unicodeStr+= String.fromCharCode(unicode) ;
        pos += 3;

      } else if ((flag &0xC0) === 0xC0 ){ //110
        unicode = (utf8Bytes[pos] & 0x3F) << 6;
        unicode |= (utf8Bytes[pos+1] & 0x3F);
        unicodeStr+= String.fromCharCode(unicode) ;
        pos += 2;

      } else{
        unicodeStr+= String.fromCharCode(utf8Bytes[pos]);
        pos += 1;
      }
    }
    return unicodeStr;
  }



  function checkInt(value) {
    return (parseInt(value) === value);
  }

  function checkInts(arrayish) {
    if (!checkInt(arrayish.length)) { return false; }

    for (var i = 0; i < arrayish.length; i++) {
      if (!checkInt(arrayish[i]) || arrayish[i] < 0 || arrayish[i] > 255) {
        return false;
      }
    }

    return true;
  }

  function coerceArray(arg, copy) {

    // ArrayBuffer view
    if (arg.buffer && arg.name === 'Uint8Array') {

      if (copy) {
        if (arg.slice) {
          arg = arg.slice();
        } else {
          arg = Array.prototype.slice.call(arg);
        }
      }

      return arg;
    }

    // It's an array; check it is a valid representation of a byte
    if (Array.isArray(arg)) {
      if (!checkInts(arg)) {
        throw new Error('Array contains invalid value: ' + arg);
      }

      return new Uint8Array(arg);
    }

    // Something else, but behaves like an array (maybe a Buffer? Arguments?)
    if (checkInt(arg.length) && checkInts(arg)) {
      return new Uint8Array(arg);
    }

    throw new Error('unsupported array-like object');
  }

  return {
    toBytes: toBytes,
    fromBytes: utf8ByteToUnicodeStr
  }
})()

針對emoji的字節(jié)字符，占兩個unicode字符。使用String.fromCharCode也可以實現(xiàn)，需要進行兩次fromCharCode，沒有fromPointCode方便。下面展示了utf-8的4字節(jié)轉換為unicode(utf-16)的過程。

//高char10位[一個unicode字符] (2+6+2=10)
unicode =  ((utf8Bytes[pos] & 0x3)) << 8 |((utf8Bytes[pos+1] & 0x3f) << 2) |((utf8Bytes[pos+2] >> 4) & 0x03);

//減去‭1F600‬中的1，這里減去6個0即可，低位char已經(jīng)占據(jù)10位
unicode = unicode - parseInt('1000000',2)

//加上utf-16高char的標識符
unicode = 0xD800 + unicode;
console.log(unicode);
unicodeStr += String.fromCharCode(unicode);

//低char10位[一個unicode字符](4+6)
unicode = ((utf8Bytes[pos+2] & 0x0F) << 6) | (utf8Bytes[pos+3] & 0x3F);
//加上utf-16低char的標識符
unicode = 0xDC00 + unicode;
console.log(unicode);
unicodeStr+= String.fromCharCode(unicode);
pos += 4;

以上所述是小編給大家介紹的js實現(xiàn)unicode碼字符串與utf8字節(jié)數(shù)據(jù)互轉詳解整合，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復大家的。在此也非常感謝大家對腳本之家網(wǎng)站的支持！

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