JavaScript Coding Style

2. Indent in
   The hierarchy of each row consists of 4 spaces
4. Length of Line
   Each line is not more than 80 characters long. If a row exceeds 80 characters, wraps after an operator (comma, plus sign), and the next line increments by 2 indents
6. Original value
   Avoid using special value undefined to determine whether a variable is defined with the TypeOf operator
8. Comments
   A) an exclusive line of comments to explain the next line of code;
   B) a comment at the end of the code line to explain the code before it;
   C) multiple lines, used to comment out a code
   

   /**/

9. Strict mode
   Strict mode should be used inside the function, never in the global use

   // Good wording. function dosomething () {    "usestrict";     // Code     }

   You can use a function that is called immediately if you expect strict mode to be used in multiple functions without declaring "use strict" multiple Times.

     (function () {  " use Strict  "  ; function dosomething () { //  code } function dosomethingelse () { // code  }} ());  

11. equals operator
    Avoid type conversion errors using = = = (strictly Equal) and!== (strictly unequal) instead of = = (equal) and! = (unequal)
    

    if (a===b) {    //  Code }

    
    

JavaScript Coding Style