微信小程序base64加密，解码

最新推荐文章于 2025-03-17 11:03:10 发布

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最新推荐文章于 2025-03-17 11:03:10 发布

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文章标签：微信小程序小程序

本文链接：https://blog.youkuaiyun.com/weixin_44032619/article/details/130806582

版权

这是一个JavaScript实现的Base64编码和解码函数库，包括_encode和_decode方法，用于对字符串进行Base64转换。函数支持UTF-8和UTF-16之间的转换，且可通过module.exports导出供其他模块使用。

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base64.js

// base64.js
var base64 = {
  _keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
  encode (str) { // 加密
    var output = "";
    var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
    var i = 0;
    str = this._utf16to8(str);
    while (i < str.length) {
      chr1 = str.charCodeAt(i++);
      chr2 = str.charCodeAt(i++);
      chr3 = str.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;
  },
  decode (input) { // 解密
    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 = 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);
        }
    } return this._utf8to16(output);
  },
  _utf16to8: function(str) {
    var out, i, len, c;
    out = "";
    len = str.length;
    for(i = 0; i < len; i++) {
        c = str.charCodeAt(i);
        if ((c >= 0x0001) && (c <= 0x007F)) {
            out += str.charAt(i);
        } else if (c > 0x07FF) {
            out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
            out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F));
            out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
        } else {
            out += String.fromCharCode(0xC0 | ((c >> 6) & 0x1F));
            out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
        }
    }
    return out;
  },
  _utf8to16 (str) { 
    var out, i, len, c;
    var char2, char3;
    out = "";
    len = str.length;
    i = 0;
    while(i < len) {
        c = str.charCodeAt(i++);
        switch(c >> 4)
        {
            case 0: case 1: case 2: case 3: case 4: case 5: case 6:case7:
              out += str.charAt(i-1);
            break;
            case 12: case 13:
              char2 = str.charCodeAt(i++);
              out += String.fromCharCode(((c & 0x1F) << 6) | (char2&0x3F));
            break;
            case 14:
              char2 = str.charCodeAt(i++);
              char3 = str.charCodeAt(i++);
              out += String.fromCharCode(((c & 0x0F) << 12) |
                ((char2 & 0x3F) << 6) |
                ((char3 & 0x3F) << 0));
            break;
        }
    } return out;
  }
}
module.exports = base64

页面使用

let base64 = require("../../../utils/base64")
 base64.decode(需要解密的内容)  //解密
 base64.encode(需要加密的内容)  //加密