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Javascript實(shí)現(xiàn)base64的加密解密方法示例

更新時(shí)間：2022年08月06日 16:04:18 作者：夜之寐

下文是base64用javascript寫出來(lái)的函數(shù)和方法。非常不錯(cuò)，具有參考借鑒價(jià)值，需要的的朋友參考下吧

這幾天使用PHP向前端傳值的時(shí)候，遇到一個(gè)問(wèn)題，要將代碼傳過(guò)去賦值。如果使用urlencode()和urldecode()函數(shù)，就會(huì)出現(xiàn)js無(wú)法解碼的情況，因?yàn)閜hp和js的相關(guān)函數(shù)算法不一致。于是準(zhǔn)備使用通用的base64加密解密。

最近剛發(fā)現(xiàn)的一個(gè)比較簡(jiǎn)單的代碼支持utf8，可以直接拿來(lái)使用。

base64加解密代碼一

function bs64DeCode(str) {
    _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
    function _utf8_decode(e) {
        var t = "";
        var n = 0;
        var r = c1 = c2 = 0;
        while (n < e.length) {
            r = e.charCodeAt(n);
            if (r < 128) {
                t += String.fromCharCode(r);
                n++
            } else if (r > 191 && r < 224) {
                c2 = e.charCodeAt(n + 1);
                t += String.fromCharCode((r & 31) << 6 | c2 & 63);
                n += 2
            } else {
                c2 = e.charCodeAt(n + 1);
                c3 = e.charCodeAt(n + 2);
                t += String.fromCharCode((r & 15) << 12 | (c2 & 63) << 6 | c3 & 63);
                n += 3
            }
        }
        return t
    }
    function decode(input) {
        var output = "";
        var chr1, chr2, chr3;
        var enc1, enc2, enc3, enc4;
        var i = 0;
        input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
        while (i < input.length) {
            enc1 = _keyStr.indexOf(input.charAt(i++));
            enc2 = _keyStr.indexOf(input.charAt(i++));
            enc3 = _keyStr.indexOf(input.charAt(i++));
            enc4 = _keyStr.indexOf(input.charAt(i++));
            chr1 = (enc1 << 2) | (enc2 >> 4);
            chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
            chr3 = ((enc3 & 3) << 6) | enc4;
            output = output + String.fromCharCode(chr1);
            if (enc3 != 64) {
                output = output + String.fromCharCode(chr2);
            }
            if (enc4 != 64) {
                output = output + String.fromCharCode(chr3);
            }
        }
        output = _utf8_decode(output);
        return output;
    }
    return decode(str);
}

// 字符串轉(zhuǎn)base64
function b64EncodeUnicode(str) {
    return btoa(encodeURIComponent(str).replace(/%([0-9A-F]{2})/g, function(match, p1) {
        return String.fromCharCode('0x' + p1);
    }));
}

base64 加密解密二

下方是base64用javascript寫出來(lái)的函數(shù)和方法。

//1.加密解密方法使用：
//1.加密 
var str = '124中文內(nèi)容'; 
var base = new Base64(); 
var result = base.encode(str); 
//document.write(result); 
//2.解密 
var result2 = base.decode(result); 
document.write(result2); 
//2.加密、解密算法封裝：
function Base64() { 
  // private property 
  _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; 
  // public method for encoding 
  this.encode = function (input) { 
    var output = ""; 
    var chr1, chr2, chr3, enc1, enc2, enc3, enc4; 
    var i = 0; 
    input = _utf8_encode(input); 
    while (i < input.length) { 
      chr1 = input.charCodeAt(i++); 
      chr2 = input.charCodeAt(i++); 
      chr3 = input.charCodeAt(i++); 
      enc1 = chr1 >> 2; 
      enc2 = ((chr1 & 3) << 4) | (chr2 >> 4); 
      enc3 = ((chr2 & 15) << 2) | (chr3 >> 6); 
      enc4 = chr3 & 63; 
      if (isNaN(chr2)) { 
        enc3 = enc4 = 64; 
      } else if (isNaN(chr3)) { 
        enc4 = 64; 
      } 
      output = output + 
      _keyStr.charAt(enc1) + _keyStr.charAt(enc2) + 
      _keyStr.charAt(enc3) + _keyStr.charAt(enc4); 
    } 
    return output; 
  } 
  // public method for decoding 
  this.decode = function (input) { 
    var output = ""; 
    var chr1, chr2, chr3; 
    var enc1, enc2, enc3, enc4; 
    var i = 0; 
    input = input.replace(/[^A-Za-z0-9\+\/\=]/g, ""); 
    while (i < input.length) { 
      enc1 = _keyStr.indexOf(input.charAt(i++)); 
      enc2 = _keyStr.indexOf(input.charAt(i++)); 
      enc3 = _keyStr.indexOf(input.charAt(i++)); 
      enc4 = _keyStr.indexOf(input.charAt(i++)); 
      chr1 = (enc1 << 2) | (enc2 >> 4); 
      chr2 = ((enc2 & 15) << 4) | (enc3 >> 2); 
      chr3 = ((enc3 & 3) << 6) | enc4; 
      output = output + String.fromCharCode(chr1); 
      if (enc3 != 64) { 
        output = output + String.fromCharCode(chr2); 
      } 
      if (enc4 != 64) { 
        output = output + String.fromCharCode(chr3); 
      } 
    } 
    output = _utf8_decode(output); 
    return output; 
  } 
  // private method for UTF-8 encoding 
  _utf8_encode = function (string) { 
    string = string.replace(/\r\n/g,"\n"); 
    var utftext = ""; 
    for (var n = 0; n < string.length; n++) { 
      var c = string.charCodeAt(n); 
      if (c < 128) { 
        utftext += String.fromCharCode(c); 
      } else if((c > 127) && (c < 2048)) { 
        utftext += String.fromCharCode((c >> 6) | 192); 
        utftext += String.fromCharCode((c & 63) | 128); 
      } else { 
        utftext += String.fromCharCode((c >> 12) | 224); 
        utftext += String.fromCharCode(((c >> 6) & 63) | 128); 
        utftext += String.fromCharCode((c & 63) | 128); 
      } 
    } 
    return utftext; 
  } 
  // private method for UTF-8 decoding 
  _utf8_decode = function (utftext) { 
    var string = ""; 
    var i = 0; 
    var c = c1 = c2 = 0; 
    while ( i < utftext.length ) { 
      c = utftext.charCodeAt(i); 
      if (c < 128) { 
        string += String.fromCharCode(c); 
        i++; 
      } else if((c > 191) && (c < 224)) { 
        c2 = utftext.charCodeAt(i+1); 
        string += String.fromCharCode(((c & 31) << 6) | (c2 & 63)); 
        i += 2; 
      } else { 
        c2 = utftext.charCodeAt(i+1); 
        c3 = utftext.charCodeAt(i+2); 
        string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63)); 
        i += 3; 
      } 
    } 
    return string; 
  } 
}

以上所述是小編給大家介紹的Javascript實(shí)現(xiàn)base64的加密解密方法，希望對(duì)大家有所幫助，如果大家有任何疑問(wèn)請(qǐng)給我留言，小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)腳本之家網(wǎng)站的支持！

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