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  • js中实现base64加密、解密

    //base64加密 解密
    
    /* //1.加密  
    var result = Base.encode('125中文');  //--> "MTI15Lit5paH"
      
    //2.解密  
    var result2 = Base.decode(result); //--> '125中文'
    */
    
    ~(function(root, factory) {
      if (typeof define === "function" && define.amd) {
        define([], factory);
      } else if (typeof module === "object" && module.exports) {
        module.exports = factory();
      } else {
        root.Base = factory();
      }
    }(this, function() {
       'use strict';
       
        function Base64() {
            // private property
            this._keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
        }
        //public method for encoding
        Base64.prototype.encode = function (input) {
            var output = "", chr1, chr2, chr3, enc1, enc2, enc3, enc4, i = 0;
            input = this._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 +
                this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
                this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
            }
            return output;
        }
    
        // public method for decoding
        Base64.prototype.decode = function (input) {
            var output = "", chr1, chr2, chr3, enc1, enc2, enc3, enc4, i = 0;
            input = input.replace(/[^A-Za-z0-9+/=]/g, "");
            while (i < input.length) {
                enc1 = this._keyStr.indexOf(input.charAt(i++));
                enc2 = this._keyStr.indexOf(input.charAt(i++));
                enc3 = this._keyStr.indexOf(input.charAt(i++));
                enc4 = this._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 = this._utf8_decode(output);
            return output;
        }
    
        // private method for UTF-8 encoding
        Base64.prototype._utf8_encode = function (string) {
            string = string.replace(/
    /g,"
    ");
            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
        Base64.prototype._utf8_decode = function (utftext) {
            var string = "", i = 0, c = 0, c1 = 0, c2 = 0, c3 = 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;
        }
        
        var Base = new Base64();
        
        return Base;
    }));
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  • 原文地址:https://www.cnblogs.com/ryans/p/6512631.html
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