Javascript, Unicode, base64 encoding and decoding

Today, I browsed a piece of video news on Sina. I wanted to download the video file and read the source code of the webpage before I found that the JS script code in it was garbled, originally, the JS script of Sina video news was encrypted. Later, I checked some information and learned about the encryption and decryption methods.

Zookeeper should have seen and understood the principles of encryption and decryption by many people. But how can I make it by method, but the encryption function is ineffective? We still need to use the encoder script encoder of M $ for encoding.
Download the encoder script:
Simplified Chinese version: Http://download.microsoft.com/download/winscript56/Install/1.0/WIN98MeXP/CN/sce10chs.exe
Traditional Chinese Version: Http://download.microsoft.com/download/winscript56/Install/1.0/W98NT42KMeXP/TW/sce10cht.exe
English: Http://download.microsoft.com/download/0/0/7/0073477f-bbf9-4510-86f9-ba51282531e3/sce10en.exe

Use JScript. encode for web page encryption and decryption (http://www.toplee.com/blog? P = 149)

Original post http://blog.21softs.com/read.php/65.htm