What is the difference between .min.js and .js files in javascript?

This article will share with you the difference between .min.js and .js files in javascript. If you have friends who don’t know the difference between the two, you can take a look at

Q&A

Q: What are .js and .min.js files?
A: .js is a JavaScript source code file, and .min.js is a compressed version of the js file.

Q: Why should it be compressed into a .min.js file?

• Reduce size
  The .min.js file is compressed, smaller in size than the js file before compilation, and has fast transmission efficiency.

• Prevent peeking and stealing the source code
  After coding, the original names of variables and functions are changed to meaningless names to prevent others from peeking and stealing the js source code

Q: What are the advantages and disadvantages of .js and .min.js files?

.js文件：
  优点： 可读性较好，易于debug和更改.
  缺点：体积较大，传输时间长
  
.min.js文件：
  优点：体积较小传输快, 源码防窃
  缺点：可读性差

Q: How to generate .min.js file?
Use compression tools:

Google的在线版本 Javascript Closure Compiler 
压缩工具参考list：  [http://www.cnblogs.com/lhb25/p/15-best-javascript-minifying-tools.html][1]

Q: Compression principle?

• Compression: Remove all comments, tabs, line breaks and useless spaces in the js code, thereby compressing the JS file size.
  

• Obfuscation: Change the original names of variables and functions to meaningless names through coding, delete useless code, inline functions, equivalent statement replacement, etc. (to prevent others from peeking and stealing Source code)

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