前端脚本运行快，但是作为一门解释性语言，如果不做混淆，代码往往对所有人透明，尤其是在一些需要前后端对称加解密的场景，解密方法对所有人可见，那么加密的效果将大大降低，爬虫开发者将很容易破解加密的数据。因此，目前很多前端网站都对一些前端的关键代码进行加密混淆。jsjiami.com提供的算法，效果很好，比较难被反混淆。
示例：
(function(w, d) {
aesKey="我是秘钥"
// 解密方法，通过秘钥将外部数据进行解密
descrpt(aesKey,data)
})(window, document);
加密混淆：
/*
* 加密工具已经升级了一个版本，目前为 jsjiami.com.v7 ，更新了加密算法，缩减了体积;
* 另外 jsjiami.com.v7 已经强制加入校验，注释可以去掉，但是 jsjiami.com.v7 不能去掉，其他都没有任何绑定。
* 誓死不会加入任何后门，JsJiami.com 加密的使命就是为了保护你们的Javascript 。
*/
var version_='jsjiami.com.v7';var _0x11bded=_0x3ddd;(function(_0x1c4e28,_0x781d5,_0xd56fb8,_0x161158,_0x15d56f,_0x361b9d,_0xc5ec37){return _0x1c4e28=_0x1c4e28>>0x3,_0x361b9d='hs',_0xc5ec37='hs',function(_0x1ad84b,_0x28d345,_0x1fe7d6,_0x43e234,_0x12894f){var _0x12ea2b=_0x3ddd;_0x43e234='tfi',_0x361b9d=_0x43e234+_0x361b9d,_0x12894f='up',_0xc5ec37+=_0x12894f,_0x361b9d=_0x1fe7d6(_0x361b9d),_0xc5ec37=_0x1fe7d6(_0xc5ec37),_0x1fe7d6=0x0;var _0x135baf=_0x1ad84b();while([图片上传失败...(image-c60f5a-1699452221006)]){if(_0x43e234===_0x28d345){_0x135baf['un'+_0x361b9d](_0x12894f);break;}_0x135baf[_0xc5ec37](_0x12894f);}}}}}(_0xd56fb8,_0x781d5,function(_0x417a5e,_0x3a49d3,_0xe90451,_0x2a3aa0,_0x1ebcc8,_0x14092f,_0x1fbc9b){return _0x3a49d3='\x73\x70\x6c\x69\x74',_0x417a5e=arguments[0x0],_0x417a5e=_0x417a5e[_0x3a49d3](''),_0xe90451='\x72\x65\x76\x65\x72\x73\x65',_0x417a5e=_0x417a5e[_0xe90451]('\x76'),_0x2a3aa0='\x6a\x6f\x69\x6e',(0x1469b4,_0x417a5e[_0x2a3aa0](''));});}(0x650,0x6e25b,_0x5f44,0xcc),_0x5f44)&&(version_=_0x11bded(0xb1,')QRW'));function _0x3ddd(_0x5a5199,_0x44a59c){var _0x5f44ae=_0x5f44();return _0x3ddd=function(_0x3ddd00,_0x3cbdc6){_0x3ddd00=_0x3ddd00-0xa8;var _0x3192e0=_0x5f44ae[_0x3ddd00];if(_0x3ddd['qyEVRF']===undefined){var _0x3a752a=function(_0x59647e){var _0x117b1c='abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789+/=';var _0x2fa79b='',_0x488673='';for(var _0x1c24d1=0x0,_0x19b80c,_0x585f87,_0x58bfde=0x0;_0x585f87=_0x59647e['charAt'](_0x58bfde++);~_0x585f87&&(_0x19b80c=_0x1c24d1%0x4?_0x19b80c*0x40+_0x585f87:_0x585f87,_0x1c24d1++%0x4)?_0x2fa79b+=String['fromCharCode'](0xff&_0x19b80c>>(-0x2*_0x1c24d1&0x6)):0x0){_0x585f87=_0x117b1c['indexOf'](_0x585f87);}for(var _0x33261a=0x0,_0x634d5f=_0x2fa79b['length'];_0x33261a<_0x634d5f;_0x33261a++){_0x488673+='%'+('00'+_0x2fa79b['charCodeAt'](_0x33261a)['toString'](0x10))['slice'](-0x2);}return decodeURIComponent(_0x488673);};var _0x380df9=function(_0x250003,_0xb545b){var _0x30081a=[],_0x20fcc3=0x0,_0x3f2df5,_0x49effd='';_0x250003=_0x3a752a(_0x250003);var _0x3c17cd;for(_0x3c17cd=0x0;_0x3c17cd<0x100;_0x3c17cd++){_0x30081a[_0x3c17cd]=_0x3c17cd;}for(_0x3c17cd=0x0;_0x3c17cd<0x100;_0x3c17cd++){_0x20fcc3=(_0x20fcc3+_0x30081a[_0x3c17cd]+_0xb545b['charCodeAt'](_0x3c17cd%_0xb545b['length']))%0x100,_0x3f2df5=_0x30081a[_0x3c17cd],_0x30081a[_0x3c17cd]=_0x30081a[_0x20fcc3],_0x30081a[_0x20fcc3]=_0x3f2df5;}_0x3c17cd=0x0,_0x20fcc3=0x0;for(var _0x532a8f=0x0;_0x532a8f<_0x250003['length'];_0x532a8f++){_0x3c17cd=(_0x3c17cd+0x1)%0x100,_0x20fcc3=(_0x20fcc3+_0x30081a[_0x3c17cd])%0x100,_0x3f2df5=_0x30081a[_0x3c17cd],_0x30081a[_0x3c17cd]=_0x30081a[_0x20fcc3],_0x30081a[_0x20fcc3]=_0x3f2df5,_0x49effd+=String['fromCharCode'](_0x250003['charCodeAt'](_0x532a8f)^_0x30081a[(_0x30081a[_0x3c17cd]+_0x30081a[_0x20fcc3])%0x100]);}return _0x49effd;};_0x3ddd['cyUcDD']=_0x380df9,_0x5a5199=arguments,_0x3ddd['qyEVRF']=[图片上传失败...(image-5674ac-1699452221006)];}(window,document));var version_ = 'jsjiami.com.v7';
示例中将密钥和解密方法进行加密混淆隐藏，同时不影响系统功能，适合打包通过服务端返回加密数据，在前端解密显示的场景，可以有效屏蔽大部分爬虫，从而提升网站性能，降低爬虫对网站的影响。
