Js/Jquery- Base64和UrlEncode編碼解碼

　　最近幾天遇到一些URL參數明文顯示的問題，因為是明文顯示，容易讓人通過改變參數查看到他沒有權限看到內容。

　　一開始我的做法是自定義了規則，然后原始的那種URL編碼。可是URL編譯后效果不理想，他無法編譯數字，而且編碼后的字符串太長。

　　最后我在網上用了BASE64這種。感覺還可以。摘錄下來，做一下備忘，以后還會用到

　　C# BASE64 解碼和編碼

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

 

     解碼：     

     //轉回到原來的 System.String。
      byte[] c = Convert.FromBase64String(a);

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

　　JS BASE64 解碼和編碼

/**
*
*  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測試頁面

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> 

 

---

 

順便把Jquery的UrlEncode也記在這里： 

Jquery字符UrlEncode 編碼、解碼 --C#UrlEncode

C#：Server.UrlEncode(ur)

Jquery解碼：decodeURIComponent(url);

Jquery編碼：encodeURIComponent(url);