网上翻了很多资料都没有自己想要的，绝大多数都是千篇一律的，几经辛苦终于找到一篇靠谱的，通俗易懂的博客。
请戳这里：https://github.com/travist/jsencrypt
作者写的很清楚了，只需要传递两个值即可，一个是公钥，一个是要加密的字符串。本人也试验过了，亲测有效，绝对靠谱。
这里只提供给伸手党，不讲理论知识。此库还提供了md5，sha等算法，十分方便。最后要感谢作者，感谢上帝。
恐防以后作者的代码有变，我这里先复制粘贴下来。
<!doctype html> <html> <head> <title>JavaScript RSA Encryption</title> <script src="http://code.jquery.com/jquery-1.8.3.min.js"></script> <script src="bin/jsencrypt.min.js"></script> <script type="text/javascript"> // Call this code when the page is done loading. $(function() { // Run a quick encryption/decryption when they click. $('#testme').click(function() { // Encrypt with the public key... var encrypt = new JSEncrypt(); encrypt.setPublicKey($('#pubkey').val()); var encrypted = encrypt.encrypt($('#input').val()); // Decrypt with the private key... var decrypt = new JSEncrypt(); decrypt.setPrivateKey($('#privkey').val()); var uncrypted = decrypt.decrypt(encrypted); // Now a simple check to see if the round-trip worked. if (uncrypted == $('#input').val()) { alert('It works!!!'); } else { alert('Something went wrong....'); } }); }); </script> </head> <body> <label for="privkey">Private Key</label><br/> <textarea id="privkey" rows="15" cols="65">-----BEGIN RSA PRIVATE KEY----- MIICXQIBAAKBgQDlOJu6TyygqxfWT7eLtGDwajtNFOb9I5XRb6khyfD1Yt3YiCgQ WMNW649887VGJiGr/L5i2osbl8C9+WJTeucF+S76xFxdU6jE0NQ+Z+zEdhUTooNR aY5nZiu5PgDB0ED/ZKBUSLKL7eibMxZtMlUDHjm4gwQco1KRMDSmXSMkDwIDAQAB AoGAfY9LpnuWK5Bs50UVep5c93SJdUi82u7yMx4iHFMc/Z2hfenfYEzu+57fI4fv xTQ//5DbzRR/XKb8ulNv6+CHyPF31xk7YOBfkGI8qjLoq06V+FyBfDSwL8KbLyeH m7KUZnLNQbk8yGLzB3iYKkRHlmUanQGaNMIJziWOkN+N9dECQQD0ONYRNZeuM8zd 8XJTSdcIX4a3gy3GGCJxOzv16XHxD03GW6UNLmfPwenKu+cdrQeaqEixrCejXdAF z/7+BSMpAkEA8EaSOeP5Xr3ZrbiKzi6TGMwHMvC7HdJxaBJbVRfApFrE0/mPwmP5 rN7QwjrMY+0+AbXcm8mRQyQ1+IGEembsdwJBAN6az8Rv7QnD/YBvi52POIlRSSIM V7SwWvSK4WSMnGb1ZBbhgdg57DXaspcwHsFV7hByQ5BvMtIduHcT14ECfcECQATe aTgjFnqE/lQ22Rk0eGaYO80cc643BXVGafNfd9fcvwBMnk0iGX0XRsOozVt5Azil psLBYuApa66NcVHJpCECQQDTjI2AQhFc1yRnCU/YgDnSpJVm1nASoRUnU8Jfm3Oz uku7JUXcVpt08DFSceCEX9unCuMcT72rAQlLpdZir876 -----END RSA PRIVATE KEY-----</textarea><br/> <label for="pubkey">Public Key</label><br/> <textarea id="pubkey" rows="15" cols="65">-----BEGIN PUBLIC KEY----- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDlOJu6TyygqxfWT7eLtGDwajtN FOb9I5XRb6khyfD1Yt3YiCgQWMNW649887VGJiGr/L5i2osbl8C9+WJTeucF+S76 xFxdU6jE0NQ+Z+zEdhUTooNRaY5nZiu5PgDB0ED/ZKBUSLKL7eibMxZtMlUDHjm4 gwQco1KRMDSmXSMkDwIDAQAB -----END PUBLIC KEY-----</textarea><br/> <label for="input">Text to encrypt:</label><br/> <textarea id="input" name="input" type="text" rows=4 cols=70>This is a test!</textarea><br/> <input id="testme" type="button" value="Test Me!!!" /><br/> </body> </html>
最后想说一句，前人栽树后人乘凉，如果你也遇到一个解不了的难题，不一定要有结果的，希望也留下你找寻答案的痕迹，留给后人一个此路不通的方向标。