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微信小程序加密不支持btoa的解决方法，window.btoa报错解决办法

 2 years ago
source link: https://thelighter.github.io/2020/08/24/weixin-8/
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微信小程序加密不支持btoa的解决方法，window.btoa报错解决办法

发表于2020-08-24|更新于2021-01-15|微信
阅读量:25

window.btoa报错解决办法

小程序中没有window对象，所以btoa使用不了

这里自己做一个 base64加密的工具

function base64_encode(str) {
  var c1, c2, c3;
  var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  var i = 0, len = str.length, string = '';

while (i < len) {
    c1 = str.charCodeAt(i++) & 0xff;
    if (i == len) {
      string += base64EncodeChars.charAt(c1 >> 2);
      string += base64EncodeChars.charAt((c1 & 0x3) << 4);
      string += "==";
      break;
    }
    c2 = str.charCodeAt(i++);
    if (i == len) {
      string += base64EncodeChars.charAt(c1 >> 2);
      string += base64EncodeChars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4));
      string += base64EncodeChars.charAt((c2 & 0xF) << 2);
      string += "=";
      break;
    }
    c3 = str.charCodeAt(i++);
    string += base64EncodeChars.charAt(c1 >> 2);
    string += base64EncodeChars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4));
    string += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >> 6));
    string += base64EncodeChars.charAt(c3 & 0x3F)
  }
  return string
}

使用这个方法可用对代码进行base64加密


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