Js/Jquery- Base64和UrlEncode编码解码

　　最近几天遇到一些URL参数明文显示的问题，因为是明文显示，容易让人通过改变参数查看到他没有权限看到内容。

　　一开始我的做法是自定义了规则，然后原始的那种URL编码。可是URL编译后效果不理想，他无法编译数字，而且编码后的字符串太长。

　　最后我在网上用了BASE64这种。感觉还可以。摘录下来，做一下备忘，以后还会用到

　　C# BASE64 解码和编码

       string a = "【OK,Let's GO】";
       byte[] b = System.Text.Encoding.Default.GetBytes(a);
       //转成 Base64 形式的 System.String
       a = Convert.ToBase64String(b);
       Console.WriteLine(a);

     解码：     

     //转回到原来的 System.String。
      byte[] c = Convert.FromBase64String(a);

      a = System.Text.Encoding.Default.GetString(c);
      Console.WriteLine(a);
 

　　JS BASE64 解码和编码

/**
*
*  Base64 encode / decode
*
*  @author haitao.tu
*  @date   2010-04-26
*  @email  [e-mail]
*
*/

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;
    }
}

JS测试页面

1.<html>
2.    <head>
3.        <script src="lib/base64.js" type="text/javascript"></script>
4.        <script type="text/javascript">
5.            var b = new Base64();
6.            var str = b.encode("admin:admin");
7.            alert("base64 encode:" + str);
8.            str = b.decode(str);
9.            alert("base64 decode:" + str);
10.        </script>
11.    </head>
12.    <body>
13.    </body>
14.</html> 

---

顺便把Jquery的UrlEncode也记在这里：

Jquery字符UrlEncode 编码、解码 --C#UrlEncode

C#：Server.UrlEncode(ur)

Jquery解码：decodeURIComponent(url);

Jquery编码：encodeURIComponent(url);