js base64

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
import json
import base64

header = {
    "name": "bubu",
    "age": "10"
}

header_string = base64.urlsafe_b64encode(json.dumps(header).encode("utf-8"))
print(header_string)
res = base64.urlsafe_b64decode(header_string)
print(res)
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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link href="https://cdn.bootcss.com/twitter-bootstrap/3.4.1/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
    <script src="https://cdn.bootcss.com/twitter-bootstrap/3.4.1/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container-fluid">
    <script>
        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;
            }
        }

        //1.加密
        var str = {
            "name": "bubu",
            "age": "10"
        };
        var base = new Base64();
        var result = base.encode(JSON.stringify(str));
        console.log(result);

        //2.解密
        var result2 = base.decode(result);
        console.log(result2, typeof (result2));
        result2 = JSON.parse(result2);
        console.log(result2.name)

    </script>

</div>
</body>
</html>
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