RSA加密长字符串，而且直接加密中文(不encode)会有问题，这里用别人提供的方法尝试可以了，这里我直接新增一个方法复用别人分段加密的算法代码

/**

• 分段加密长字符串-支持中文的
• @param {string} str the string to encrypt
• @return {string} the encrypted string encoded in base64
• @public */ JSEncrypt.prototype.encryptLongSupportCh = function (string) { var k = this.getKey(); try { var lt = ''; var ct = ''; //RSA每次加密117bytes，需要辅助方法判断字符串截取位置 //1.获取字符串截取点 var bytes = new Array(); bytes.push(0); var byteNo = 0; var len, c; len = string.length; var temp = 0; for (var i = 0; i < len; i++) { c = string.charCodeAt(i); if (c >= 0x010000 && c <= 0x10ffff) { byteNo += 4; } else if (c >= 0x000800 && c <= 0x00ffff) { byteNo += 3; } else if (c >= 0x000080 && c <= 0x0007ff) { byteNo += 2; } else { byteNo += 1; } if (byteNo % 117 >= 114 || byteNo % 117 == 0) { if (byteNo - temp >= 114) { bytes.push(i); temp = byteNo; } } } //2.截取字符串并分段加密 if (bytes.length > 1) { for (var i = 0; i < bytes.length - 1; i++) { var str; if (i == 0) { str = string.substring(0, bytes[i + 1] + 1); } else { str = string.substring(bytes[i] + 1, bytes[i + 1] + 1); } var t1 = k.encrypt(str); ct += t1; } if (bytes[bytes.length - 1] != string.length - 1) { var lastStr = string.substring(bytes[bytes.length - 1] + 1); ct += k.encrypt(lastStr); } return hex2b64(ct); } var t = k.encrypt(string); var y = hex2b64(t); return y; } catch (ex) { return false; } };