JS BASE64

var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
            //将Ansi编码的字符串进行Base64编码
            var encode64 = function(input) {
                var output = "";
                var chr1, chr2, chr3 = "";
                var enc1, enc2, enc3, enc4 = "";
                var i = 0;
                do {
                    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);
                    chr1 = chr2 = chr3 = "";
                    enc1 = enc2 = enc3 = enc4 = "";
                } while (i < input.length);
                return output;
            }
            var 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;
            }

 encode64(utf16to8(xxx))

JS进行base64编码,然后服务端进行base64解码，不过记住不能get形式通过URL传，否则+号会有问题，但是如果不需要加密的话一般可以encodeURIComponent(XXX)解决