最流行的JavaScript代码规范

什么是最佳的JavaScript代码编程规范？这可能是一个众口难调的问题。那么，不妨换个问题，什么代码规范最流行？

sideeffect.kr通过分析GitHub上托管的开源代码，得出了一些有趣的结果。一起来看看吧。





行末逗号对行首逗号

行末引号：

var foo = 1, 
    bar = 2, 
    baz = 3; 
 
var obj = { 
    foo: 1, 
    bar: 2, 
    baz: 3 
}; 

行首引号：

var foo = 1 
  , bar = 2 
  , baz = 3; 
 
var obj = { 
    foo: 1 
  , bar: 2 
  , baz: 3 
}; 

行末，92.345%；行首，7.655%。（基于1,100,251次提交统计。）

空格和Tab

这年头大家都爱用空格了。使用空格缩进可以保证不同的开发者、不同的编辑器设置下看到的结果是一样的。

空格，81.1 %；Tab，18.9 %。（基于2,019,550次提交统计。）

函数后是否添加空格

无空格

function foo() { 
  return "bar"; 
} 

有空格

function foo () { 
  return "bar"; 
} 

无空格，67.424 %；有空格，32.576 %。（基于1,212,488次提交统计。）

参数与括号间是否有空格

无空格

function fn(arg1, arg2) { 
//or 
if (true) { 

有空格

function fn( arg1, arg2 ) { 
  // ... 
} 
 
if ( true ) { 
  // ... 
} 

无空格，94.31 %；有空格，5.69 %。（基于1,514,971次提交统计。）

对象字面量中冒号周围是否有空格

冒号后有空格

{ 
  foo: 1, 
  bar: 2, 
  baz: 3 
} 

冒号后无空格

{ 
  foo:1, 
  bar:2, 
  baz:3 
} 

冒号前后均有空格

{ 
  foo : 1, 
  bar : 2, 
  baz : 3 
} 

后空格，62.955 %；无空格，22.891 %；前后空格，14.154 %。（基于1,300,035次提交统计。）

个人觉得，无空格太挤了，不利于快速分清key和value。前后空格的话，恐怕需要对齐冒号，看起来才美观，从统计数据来看，大部分程序员懒得对齐冒号（还是说，大部分程序员的IDE或编辑器不够智能？）

条件语句

有空格

if (true) { 
  //... 
} 
 
while (true) { 
  //... 
} 
 
switch (v) { 
  //... 
} 

无空格

if(true) { 
  //... 
} 
 
while(true) { 
  //... 
} 
 
switch(v) { 
  //... 
} 

有空格，78.276 %；无空格，21.724 %。（基于1,163,316次提交。）

单引号、双引号

单引号，56.791 %；双引号，43.209 %。（基于1,705,910次提交。）

总结

所以说，最流行的代码规范是:

行末逗号

空格缩进

函数名称后无空格

函数参数与括号间无空格

对象字面量的冒号后加空格，冒号前不加

条件语句关键字后加空格

流行的不一定是好的（比如流行性感冒），但是从交流的角度来说，按照流行的风格编写代码，可以让你的代码在大多数人看起来更习惯。
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