概述
1. 常量使用const;
2. 变量使用let;
3. let 和 const 的块级作用域;
4. 不使用new来创建数组和对象;
5. 使用对象方法的简写(es6);
// bad
const atom = {
value: 1,
addValue: function (value) {
return atom.value + value;
},
};
// good
const atom = {
value: 1,
addValue(value) {
return atom.value + value;
},
};
6. 对象属性值简写,并放在前面
const obj = {
episodeOne: 1,
twoJediWalkIntoACantina: 2,
lukeSkywalker,
episodeThree: 3,
mayTheFourth: 4,
anakinSkywalker,
};
// good
const obj = {
lukeSkywalker,
anakinSkywalker,
episodeOne: 1,
twoJediWalkIntoACantina: 2,
episodeThree: 3,
mayTheFourth: 4,
};
7. 只有对象属性是无效标识符时,才会使用单引号;
// bad
const bad = {
'foo': 3,
'bar': 4,
'data-blah': 5,
};
// good
const good = {
foo: 3,
bar: 4,
'data-blah': 5,
};
8. 不要直接使用对象的原型方法,如 hasOwnProperty
, propertyIsEnumerable
, and isPrototypeOf等;因为对象可能是个NULL或者OBJECT.CREATE(NULL);最佳实践如下:
// bad
console.log(object.hasOwnProperty(key));
// good
console.log(Object.prototype.hasOwnProperty.call(object, key));
// best
const has = Object.prototype.hasOwnProperty; // cache the lookup once, in module scope.
/* or */
import has from 'has'; // https://www.npmjs.com/package/has
// ...
console.log(has.call(object, key));
9. 复制对象或者为对象添加新属性,用对象扩展符代替OBJECT.ASSIGN
// very bad
const original = { a: 1, b: 2 };
const copy = Object.assign(original, { c: 3 }); // this mutates `original` ಠ_ಠ
delete copy.a; // so does this
// bad
const original = { a: 1, b: 2 };
const copy = Object.assign({}, original, { c: 3 }); // copy => { a: 1, b: 2, c: 3 }
// good
const original = { a: 1, b: 2 };
const copy = { ...original, c: 3 }; // copy => { a: 1, b: 2, c: 3 }
const { a, ...noA } = copy; // noA => { b: 2, c: 3 }
ARRAYS
10. 使用数组扩展符代替循环浅复制数组;
// bad
const len = items.length;
const itemsCopy = [];
let i;
for (i = 0; i < len; i += 1) {
itemsCopy[i] = items[i];
}
// good
const itemsCopy = [...items];
11. 使用数组扩展符代替ARRAY.FORM() 将可迭代对象转换为数组
const foo = document.querySelectorAll('.foo');
// good
const nodes = Array.from(foo);
// best
const nodes = [...foo];
12. 使用ARRAY.FROM()将一个像数组的对象转换为数组
const arrLike = { 0: 'foo', 1: 'bar', 2: 'baz', length: 3 };
// bad
const arr = Array.prototype.slice.call(arrLike);
// good
const arr = Array.from(arrLike);
13. 使用ARRAY.FROM代替数组扩展符来map可迭代对象或数组
// bad
const baz = [...foo].map(bar);
// good
const baz = Array.from(foo, bar);
14. 在数组方法的回调中使用return语句
// good
[1, 2, 3].map((x) => {
const y = x + 1;
return x * y;
});
// good
[1, 2, 3].map(x => x + 1);
// bad - no returned value means `acc` becomes undefined after the first iteration
[[0, 1], [2, 3], [4, 5]].reduce((acc, item, index) => {
const flatten = acc.concat(item);
});
// good
[[0, 1], [2, 3], [4, 5]].reduce((acc, item, index) => {
const flatten = acc.concat(item);
return flatten;
});
// bad
inbox.filter((msg) => {
const { subject, author } = msg;
if (subject === 'Mockingbird') {
return author === 'Harper Lee';
} else {
return false;
}
});
// good
inbox.filter((msg) => {
const { subject, author } = msg;
if (subject === 'Mockingbird') {
return author === 'Harper Lee';
}
return false;
});
解构赋值
15. 当接收多个属性的对象作为参数时,使用对象的解构赋值
// bad
function getFullName(user) {
const firstName = user.firstName;
const lastName = user.lastName;
return `${firstName} ${lastName}`;
}
// good
function getFullName(user) {
const { firstName, lastName } = user;
return `${firstName} ${lastName}`;
}
// best
function getFullName({ firstName, lastName }) {
return `${firstName} ${lastName}`;
}
16. 使用对象的解构赋值
const arr = [1, 2, 3, 4];
// bad
const first = arr[0];
const second = arr[1];
// good
const [first, second] = arr;
17. 当函数有多个返回值时,使用对象解构赋值而不是数组解构赋值;
// bad
function processInput(input) {
// then a miracle occurs
return [left, right, top, bottom];
}
// the caller needs to think about the order of return data
const [left, __, top] = processInput(input);
// good
function processInput(input) {
// then a miracle occurs
return { left, right, top, bottom };
}
// the caller selects only the data they need
const { left, top } = processInput(input);
Strings
18. 字符串使用单引号,当有变量或者换行时,使用重音符号;
// bad
const name = "Capt. Janeway";
// bad - template literals should contain interpolation or newlines
const name = `Capt. Janeway`;
// good
const name = 'Capt. Janeway';
19. 字符串超过100字节时,不应该换行或者折行
// bad
const errorMessage = 'This is a super long error that was thrown because
of Batman. When you stop to think about how Batman had anything to do
with this, you would get nowhere
fast.';
// bad
const errorMessage = 'This is a super long error that was thrown because ' +
'of Batman. When you stop to think about how Batman had anything to do ' +
'with this, you would get nowhere fast.';
// good
const errorMessage = 'This is a super long error that was thrown because of Batman. When you stop to think about how Batman had anything to do with this, you would get nowhere fast.';
20. 当字符串中连接变量是使用模板字符串,而不是字符串连接; eslint: prefer-template
// bad
function sayHi(name) {
return 'How are you, ' + name + '?';
}
// bad
function sayHi(name) {
return ['How are you, ', name, '?'].join();
}
// bad
function sayHi(name) {
return `How are you, ${ name }?`;
}
// good
function sayHi(name) {
return `How are you, ${name}?`;
}
21. 不要在字符串上使用EVAL()方法;
22. 尽量不要有不必要的转义;
// bad
const foo = ''this' is "quoted"';
// good
const foo = ''this' is "quoted"';
const foo = `my name is '${name}'`;
Functions
23. 使用命名函数代替函数声明
// bad
function foo() {
// ...
}
// bad
const foo = function () {
// ...
};
// good
// lexical name distinguished from the variable-referenced invocation(s)
const short = function longUniqueMoreDescriptiveLexicalFoo() {
// ...
};
24. 用括号包裹立即执行函数
// immediately-invoked function expression (IIFE)
(function () {
console.log('Welcome to the Internet. Please follow me.');
}());
25. 不要在if或者while等无函数块的{}中声明一个函数;
26. 定义一个语句代替一个函数声明
// immediately-invoked function expression (IIFE)
(function () {
console.log('Welcome to the Internet. Please follow me.');
}());
27. 不要使用arguments作为函数参数,否则arguments对象会有先于给出的函数作用域;
// bad
function foo(name, options, arguments) {
// ...
}
// good
function foo(name, options, args) {
// ...
}
28. 不要使用arguments, 使用剩余参数代替
// bad
function concatenateAll() {
const args = Array.prototype.slice.call(arguments);
return args.join('');
}
// good
function concatenateAll(...args) {
return args.join('');
}
29. 使用默认参数语法
// really bad
function handleThings(opts) {
// No! We shouldn’t mutate function arguments.
// Double bad: if opts is falsy it'll be set to an object which may
// be what you want but it can introduce subtle bugs.
opts = opts || {};
// ...
}
// still bad
function handleThings(opts) {
if (opts === void 0) {
opts = {};
}
// ...
}
// good
function handleThings(opts = {}) {
// ...
}
30. 避免默认参数的副作用
var b = 1;
// bad
function count(a = b++) {
console.log(a);
}
count(); // 1
count(); // 2
count(3); // 3
count(); // 3
31. 总把默认参数放在最后
// bad
function handleThings(opts = {}, name) {
// ...
}
// good
function handleThings(name, opts = {}) {
// ...
}
32. 不要使用函数构造器创建一个新函数
// bad
var add = new Function('a', 'b', 'return a + b');
// still bad
var subtract = Function('a', 'b', 'return a - b');
33. 注意空格在声明函数时
// bad
const f = function(){};
const g = function (){};
const h = function() {};
// good
const x = function () {};
const y = function a() {};
34. 避免错误参数
// bad
function f1(obj) {
obj.key = 1;
}
// good
function f2(obj) {
const key = Object.prototype.hasOwnProperty.call(obj, 'key') ? obj.key : 1;
}
35. 避免重命名参数
// bad
function f1(a) {
a = 1;
// ...
}
function f2(a) {
if (!a) { a = 1; }
// ...
}
// good
function f3(a) {
const b = a || 1;
// ...
}
function f4(a = 1) {
// ...
}
36. 使用扩展运算符call可变参数函数
// bad
const x = [1, 2, 3, 4, 5];
console.log.apply(console, x);
// good
const x = [1, 2, 3, 4, 5];
console.log(...x);
// bad
new (Function.prototype.bind.apply(Date, [null, 2016, 8, 5]));
// good
new Date(...[2016, 8, 5]);
37. 多个参数的函数,每个参数应该各占一行
// bad
function foo(bar,
baz,
quux) {
// ...
}
// good
function foo(
bar,
baz,
quux,
) {
// ...
}
// bad
console.log(foo,
bar,
baz);
// good
console.log(
foo,
bar,
baz,
);
Arrow Functions
38. 当时使用匿名函数时,必须使用箭头函数
// bad
[1, 2, 3].map(function (x) {
const y = x + 1;
return x * y;
});
// good
[1, 2, 3].map((x) => {
const y = x + 1;
return x * y;
});
39. 如果函数体返回一个简单语句,省略大括号并使用隐式返回。否则使用大括号,并使用return语句。
/ bad
[1, 2, 3].map(number => {
const nextNumber = number + 1;
`A string containing the ${nextNumber}.`;
});
// good
[1, 2, 3].map(number => `A string containing the ${number + 1}.`);
// good
[1, 2, 3].map((number) => {
const nextNumber = number + 1;
return `A string containing the ${nextNumber}.`;
});
// good
[1, 2, 3].map((number, index) => ({
[index]: number,
}));
// No implicit return with side effects
function foo(callback) {
const val = callback();
if (val === true) {
// Do something if callback returns true
}
}
let bool = false;
// bad
foo(() => bool = true);
// good
foo(() => {
bool = true;
});
40. 为了更好的阅读,用括号()包裹多行表达式;
// bad
['get', 'post', 'put'].map(httpMethod => Object.prototype.hasOwnProperty.call(
httpMagicObjectWithAVeryLongName,
httpMethod,
)
);
// good
['get', 'post', 'put'].map(httpMethod => (
Object.prototype.hasOwnProperty.call(
httpMagicObjectWithAVeryLongName,
httpMethod,
)
));
41. 如果 你的函数只有一个参数并不带大括号,可以省略参数的括号。否则,参数必须有括号,函数体也可以用圆括号;
/ bad
[1, 2, 3].map((x) => x * x);
// good
[1, 2, 3].map(x => x * x);
// good
[1, 2, 3].map(number => (
`A long string with the ${number}. It’s so long that we don’t want it to take up space on the .map line!`
));
// bad
[1, 2, 3].map(x => {
const y = x + 1;
return x * y;
});
// good
[1, 2, 3].map((x) => {
const y = x + 1;
return x * y;
});
42. 避免在箭头函数的函数体中使用<=
, >=;
// bad
const itemHeight = item => item.height <= 256 ? item.largeSize : item.smallSize;
// bad
const itemHeight = (item) => item.height >= 256 ? item.largeSize : item.smallSize;
// good
const itemHeight = item => (item.height <= 256 ? item.largeSize : item.smallSize);
// good
const itemHeight = (item) => {
const { height, largeSize, smallSize } = item;
return height <= 256 ? largeSize : smallSize;
};
43. 强制箭头函数体隐式返回的位置
// bad
foo =>
bar;
foo =>
(bar);
// good
foo => bar;
foo => (bar);
foo => (
bar
)
Classes & Constructors
44. 使用class,避免使用多个prototype
// bad
function Queue(contents = []) {
this.queue = [...contents];
}
Queue.prototype.pop = function () {
const value = this.queue[0];
this.queue.splice(0, 1);
return value;
};
// good
class Queue {
constructor(contents = []) {
this.queue = [...contents];
}
pop() {
const value = this.queue[0];
this.queue.splice(0, 1);
return value;
}
}
45. 使用extends来继承
// bad
const inherits = require('inherits');
function PeekableQueue(contents) {
Queue.apply(this, contents);
}
inherits(PeekableQueue, Queue);
PeekableQueue.prototype.peek = function () {
return this.queue[0];
};
// good
class PeekableQueue extends Queue {
peek() {
return this.queue[0];
}
}
46. 方法总是返回this来支持链式调用
// bad
Jedi.prototype.jump = function () {
this.jumping = true;
return true;
};
Jedi.prototype.setHeight = function (height) {
this.height = height;
};
const luke = new Jedi();
luke.jump(); // => true
luke.setHeight(20); // => undefined
// good
class Jedi {
jump() {
this.jumping = true;
return this;
}
setHeight(height) {
this.height = height;
return this;
}
}
const luke = new Jedi();
luke.jump()
.setHeight(20);
47. 为类写一个普通的toString()方法保证类的正常执行
class Jedi {
constructor(options = {}) {
this.name = options.name || 'no name';
}
getName() {
return this.name;
}
toString() {
return `Jedi - ${this.getName()}`;
}
}
48. 避免复制类成员
// bad
class Foo {
bar() { return 1; }
bar() { return 2; }
}
// good
class Foo {
bar() { return 1; }
}
// good
class Foo {
bar() { return 2; }
}
Modules
49. 在不标准的模块系统中使用import和export,可以转换到其他的模块系统;
// bad
const AirbnbStyleGuide = require('./AirbnbStyleGuide');
module.exports = AirbnbStyleGuide.es6;
// ok
import AirbnbStyleGuide from './AirbnbStyleGuide';
export default AirbnbStyleGuide.es6;
// best
import { es6 } from './AirbnbStyleGuide';
export default es6;
50. 不要使用通配符引入
// bad
import * as AirbnbStyleGuide from './AirbnbStyleGuide';
// good
import AirbnbStyleGuide from './AirbnbStyleGuide';
51. 不要从一个引入中直接导出
// bad
// filename es6.js
export { es6 as default } from './AirbnbStyleGuide';
// good
// filename es6.js
import { es6 } from './AirbnbStyleGuide';
export default es6;
52. 从单一路径引入多个模块
// bad
import foo from 'foo';
// … some other imports … //
import { named1, named2 } from 'foo';
// good
import foo, { named1, named2 } from 'foo';
// good
import foo, {
named1,
named2,
} from 'foo';
53. 不要导出一个可变的变量
// bad
let foo = 3;
export { foo };
// good
const foo = 3;
export { foo };
54. 导出单一模块时,尽量命名
// bad
export function foo() {}
// good
export default function foo() {}
55. 把所有的import语句放在一起,最好在文件的开头
// bad
import foo from 'foo';
foo.init();
import bar from 'bar';
// good
import foo from 'foo';
import bar from 'bar';
foo.init();
56. 多行导入应该缩进,就像多行数组和对象文本一样
57. 在模块导入语句中不允许Webpack加载器语法
// bad
import fooSass from 'css!sass!foo.scss';
import barCss from 'style!css!bar.css';
// good
import fooSass from 'foo.scss';
import barCss from 'bar.css';
Iterators and Generators
58. 不使用迭代器。用内置函数来代替for in 和for of;Use map()
/ every()
/ filter()
/ find()
/ findIndex()
/ reduce()
/ some()
/ ... to iterate over arrays, and Object.keys()
/ Object.values()
/ Object.entries()
to produce arrays so you can iterate over objects.
const numbers = [1, 2, 3, 4, 5];
// bad
let sum = 0;
for (let num of numbers) {
sum += num;
}
sum === 15;
// good
let sum = 0;
numbers.forEach((num) => {
sum += num;
});
sum === 15;
// best (use the functional force)
const sum = numbers.reduce((total, num) => total + num, 0);
sum === 15;
// bad
const increasedByOne = [];
for (let i = 0; i < numbers.length; i++) {
increasedByOne.push(numbers[i] + 1);
}
// good
const increasedByOne = [];
numbers.forEach((num) => {
increasedByOne.push(num + 1);
});
// best (keeping it functional)
const increasedByOne = numbers.map(num => num + 1);
59. 现在不要使用生成器(es5支持不是很好)
Properties
60. 访问属性使用点号;
61. 使用中括号访问属性中的变量;
62. 计算指数时使用指数运算符**
Variables
63. 使用let或者const声明变量;
64. 每个变量或赋值使用一个const或let声明;
65. 集中使用const或者let;
// bad
let i, len, dragonball,
items = getItems(),
goSportsTeam = true;
// bad
let i;
const items = getItems();
let dragonball;
const goSportsTeam = true;
let len;
// good
const goSportsTeam = true;
const items = getItems();
let dragonball;
let i;
let length;
66. 将变量分配到需要它们的地方,但要将它们放在合理的位置;
67. 禁止链式的声明变量;
68. 避免使用++或者--;
69. 禁止未使用的变量;
Hoisting(提升)
70. 变量会提升至最近的函数作用域的顶部,但是赋值不会;const 和 let 是有一个暂时性死区;
71. 匿名函数表达式提升变量的名字,函数体不会提升;
function example() {
console.log(anonymous); // => undefined
anonymous(); // => TypeError anonymous is not a function
var anonymous = function () {
console.log('anonymous function expression');
};
}
72. 命名函数表达式提升变量的名字,但是不会提升函数名字和函数体;
function example() {
console.log(named); // => undefined
named(); // => TypeError named is not a function
superPower(); // => ReferenceError superPower is not defined
var named = function superPower() {
console.log('Flying');
};
}
// the same is true when the function name
// is the same as the variable name.
function example() {
console.log(named); // => undefined
named(); // => TypeError named is not a function
var named = function named() {
console.log('named');
};
}
73. 函数声明提升函数名字和函数体;
Comparison Operators & Equality
74. 使用===或者!==代替==或者!=
75. if语句判断
- Objects evaluate to true
- Undefined evaluates to false
- Null evaluates to false
- Booleans evaluate to the value of the boolean
- Numbers evaluate to false if +0, -0, or NaN, otherwise true
- Strings evaluate to false if an empty string
''
, otherwise true
76. 在switch中的case和default中使用{}
77. 三元表达式不该嵌套,使用单行表达式
// bad
const foo = maybe1 > maybe2
? "bar"
: value1 > value2 ? "baz" : null;
// split into 2 separated ternary expressions
const maybeNull = value1 > value2 ? 'baz' : null;
// better
const foo = maybe1 > maybe2
? 'bar'
: maybeNull;
// best
const foo = maybe1 > maybe2 ? 'bar' : maybeNull;
78. 避免不必要的三元表达式
// bad
const foo = a ? a : b;
const bar = c ? true : false;
const baz = c ? false : true;
// good
const foo = a || b;
const bar = !!c;
const baz = !c;
79. 混合运算用括号包裹
// bad
const foo = a && b < 0 || c > 0 || d + 1 === 0;
// bad
const bar = a ** b - 5 % d;
// bad
// one may be confused into thinking (a || b) && c
if (a || b && c) {
return d;
}
// good
const foo = (a && b < 0) || c > 0 || (d + 1 === 0);
// good
const bar = (a ** b) - (5 % d);
// good
if (a || (b && c)) {
return d;
}
// good
const bar = a + b / c * d;
Blocks
80. 使用大括号包裹多行表达式;
81. 在多行块中使用 if 和 else,把else写在 if 的关闭括号中
// bad
if (test) {
thing1();
thing2();
}
else {
thing3();
}
// good
if (test) {
thing1();
thing2();
} else {
thing3();
}
Control Statements
82. 如果控制语句过长,每个条件应该放在一行,逻辑运算符放在最开始。
// bad
if ((foo === 123 || bar === 'abc') && doesItLookGoodWhenItBecomesThatLong() && isThisReallyHappening()) {
thing1();
}
// bad
if (foo === 123 &&
bar === 'abc') {
thing1();
}
// bad
if (foo === 123
&& bar === 'abc') {
thing1();
}
// bad
if (
foo === 123 &&
bar === 'abc'
) {
thing1();
}
// good
if (
foo === 123
&& bar === 'abc'
) {
thing1();
}
// good
if (
(foo === 123 || bar === 'abc')
&& doesItLookGoodWhenItBecomesThatLong()
&& isThisReallyHappening()
) {
thing1();
}
// good
if (foo === 123 && bar === 'abc') {
thing1();
}
83. 不要使用选择操作符来代替控制语句。
// bad
!isRunning && startRunning();
// good
if (!isRunning) {
startRunning();
}
Comments
84. 多行注释使用/** ... */;
85. 单行注释使用//;
86. 注释开头写一个空格;
87. 在注释的开头加FIXME或者TODE等前缀,
Whitespace
88. TAB设置2个空格;
89. 大括号前加一个空格;
90. 在控制语句中()前加一个空格,arguments lists 和 函数名后不加空格;
91. 运算符前后加空格;
92. 折行使用长的方法调用链,点号放前面;
93. 块后或者新语句空行;
94. 块中不要放置空行;
95. 不要使用多个空行来分割代码;
96. 不要在圆括号或者中括号中加空格;
97. 在花括号中加空格;
98. 避免使用过长(超过100字节)的代码;
99. 逗号前不加空格,逗号后加一个空格;
100. 避免在函数和调用之间加空格;
101. 对象属性值前加空格;
102. 避免行位空格;
Commas
103. 对象属性值后或者参数后加逗号;
Semicolons
// bad - raises exception
const luke = {}
const leia = {}
[luke, leia].forEach(jedi => jedi.father = 'vader')
// bad - raises exception
const reaction = "No! That’s impossible!"
(async function meanwhileOnTheFalcon() {
// handle `leia`, `lando`, `chewie`, `r2`, `c3p0`
// ...
}())
// bad - returns `undefined` instead of the value on the next line - always happens when `return` is on a line by itself because of ASI!
function foo() {
return
'search your feelings, you know it to be foo'
}
// good
const luke = {};
const leia = {};
[luke, leia].forEach((jedi) => {
jedi.father = 'vader';
});
// good
const reaction = "No! That’s impossible!";
(async function meanwhileOnTheFalcon() {
// handle `leia`, `lando`, `chewie`, `r2`, `c3p0`
// ...
}());
// good
function foo() {
return 'search your feelings, you know it to be foo';
}
Type Casting & Coercion
// STRING
// => this.reviewScore = 9;
// bad
const totalScore = new String(this.reviewScore); // typeof totalScore is "object" not "string"
// bad
const totalScore = this.reviewScore + ''; // invokes this.reviewScore.valueOf()
// bad
const totalScore = this.reviewScore.toString(); // isn’t guaranteed to return a string
// good
const totalScore = String(this.reviewScore);
// NUMBER
const inputValue = '4';
// bad
const val = new Number(inputValue);
// bad
const val = +inputValue;
// bad
const val = inputValue >> 0;
// bad
const val = parseInt(inputValue);
// good
const val = Number(inputValue);
// good
const val = parseInt(inputValue, 10);
// BOOLEAN
const inputValue = '4';
// bad
const val = new Number(inputValue);
// bad
const val = +inputValue;
// bad
const val = inputValue >> 0;
// bad
const val = parseInt(inputValue);
// good
const val = Number(inputValue);
// good
const val = parseInt(inputValue, 10);
Naming Conventions
104. 避免一个字母的名字;
105. 命名对象使用驼峰命名;
106. 命名类或者construtor时, 首字母大写;
107. 不要在开头或者行尾加下划线;
108. 不要保存this,使用箭头函数或者function&&bind;
109. 导出一个方法时使用驼峰命名法;
110. 导出 constructor / class / singleton / function library / bare object.时使用首字母大写;
111. 首字母缩写应该都大写或者小写;
112. 只有在导出常量(1)、常量(2)是常量(不能重新分配)和常量(3)程序员可以信任常量(及其嵌套属性)永不更改时,才可以选择大写。
Accessors
113. 如果方法或者属性是个布尔值,应该用isVal()
or hasVal();
最后
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