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JavaScript教程:Airbnb代码规范


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分类 JS学习   发布 ourjs  1385601873000
注意 转载须保留原文链接,译文链接,作者译者等信息。  

下文是来自Airbnb的一篇JavaScript的格式规范,不过对于其中一点,笔者并不同意,文中不推荐使用前置逗号分隔:

// bad
var once
  , upon
  , aTime;

但笔者更倾向于使用Twitter 的代码风格,即使用前置逗号,然后最后一个变量不加分号,或结束分号与逗号对齐。这样新加变量只需影响当前行,并且可以尽可能避免逗号被遗忘,这是我和我身边的程序员在写JSON对象时经常出现的一个拼写错误。

// twitter
var once
  , upon
  , aTime

// or var once , upon , aTime
;

 

不过Airbnb的教程还是写得比较全面的,是学习JS一篇不错的素材。

A mostly reasonable approach to JavaScript  https://github.com/airbnb/javascript

Table of Contents

  1. Types
  2. Objects
  3. Arrays
  4. Strings
  5. Functions
  6. Properties
  7. Variables
  8. Hoisting
  9. Conditional Expressions & Equality
  10. Blocks
  11. Comments
  12. Whitespace
  13. Commas
  14. Semicolons
  15. Type Casting & Coercion
  16. Naming Conventions
  17. Accessors
  18. Constructors
  19. Events
  20. Modules
  21. jQuery

Types

  • Primitives: When you access a primitive type you work directly on its value

    • string
    • number
    • boolean
    • null
    • undefined
    var foo = 1,
        bar = foo;
    
    bar = 9;
    
    console.log(foo, bar); // => 1, 9
    
  • Complex: When you access a complex type you work on a reference to its value

    • object
    • array
    • function
    var foo = [1, 2],
        bar = foo;
    
    bar[0] = 9;
    
    console.log(foo[0], bar[0]); // => 9, 9
    

    [⬆]

Objects

  • Use the literal syntax for object creation.

    // bad
    var item = new Object();
    
    // good
    var item = {};
    
  • Don't use reserved words as keys. It won't work in IE8. More info

    // bad
    var superman = {
      default: { clark: 'kent' },
      private: true
    };
    
    // good
    var superman = {
      defaults: { clark: 'kent' },
      hidden: true
    };
    
  • Use readable synonyms in place of reserved words.

    // bad
    var superman = {
      class: 'alien'
    };
    
    // bad
    var superman = {
      klass: 'alien'
    };
    
    // good
    var superman = {
      type: 'alien'
    };
    

    [⬆]

Arrays

  • Use the literal syntax for array creation

    // bad
    var items = new Array();
    
    // good
    var items = [];
    
  • If you don't know array length use Array#push.

    var someStack = [];
    
    // bad
    someStack[someStack.length] = 'abracadabra';
    
    // good
    someStack.push('abracadabra');
    
  • When you need to copy an array use Array#slice. jsPerf

    var len = items.length,
        itemsCopy = [],
        i;
    
    // bad
    for (i = 0; i < len; i++) {
      itemsCopy[i] = items[i];
    }
    
    // good
    itemsCopy = items.slice();
    
  • To convert an array-like object to an array, use Array#slice.

    function trigger() {
      var args = Array.prototype.slice.call(arguments);
      ...
    }
    

    [⬆]

Strings

    • Use single quotes '' for strings

      // bad
      var name = "Bob Parr";
      
      // good
      var name = 'Bob Parr';
      
      // bad
      var fullName = "Bob " + this.lastName;
      
      // good
      var fullName = 'Bob ' + this.lastName;
      
    • Strings longer than 80 characters should be written across multiple lines using string concatenation.

    • Note: If overused, long strings with concatenation could impact performance. jsPerf & Discussion

      // bad
      var 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
      var 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
      var 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.';
      
    • When programatically building up a string, use Array#join instead of string concatenation. Mostly for IE: jsPerf.

      var items,
          messages,
          length,
          i;
      
      messages = [{
          state: 'success',
          message: 'This one worked.'
      },{
          state: 'success',
          message: 'This one worked as well.'
      },{
          state: 'error',
          message: 'This one did not work.'
      }];
      
      length = messages.length;
      
      // bad
      function inbox(messages) {
        items = '
        '
      ;
      
        for (i = 0; i < length; i++) {
          items += '
    • '
    •  + messages[i].message + '
    • '

;}returnitems+''; } // good function inbox(messages) { items = []; for (i = 0; i < length; i++) { items[i] = messages[i].message; } return '

  • '

+ items.join('

  • '

) + ''; }

 

[⬆]

Functions

  • Function expressions:

    // anonymous function expression
    var anonymous = function() {
      return true;
    };
    
    // named function expression
    var named = function named() {
      return true;
    };
    
    // immediately-invoked function expression (IIFE)
    (function() {
      console.log('Welcome to the Internet. Please follow me.');
    })();
    
  • Never declare a function in a non-function block (if, while, etc). Assign the function to a variable instead. Browsers will allow you to do it, but they all interpret it differently, which is bad news bears.

  • Note: ECMA-262 defines a block as a list of statements. A function declaration is not a statement. Read ECMA-262's note on this issue.

    // bad
    if (currentUser) {
      function test() {
        console.log('Nope.');
      }
    }
    
    // good
    var test;
    if (currentUser) {
      test = function test() {
        console.log('Yup.');
      };
    }
    
  • Never name a parameter arguments, this will take precedence over the arguments object that is given to every function scope.

    // bad
    function nope(name, options, arguments) {
      // ...stuff...
    }
    
    // good
    function yup(name, options, args) {
      // ...stuff...
    }
    

    [⬆]

Properties

  • Use dot notation when accessing properties.

    var luke = {
      jedi: true,
      age: 28
    };
    
    // bad
    var isJedi = luke['jedi'];
    
    // good
    var isJedi = luke.jedi;
    
  • Use subscript notation [] when accessing properties with a variable.

    var luke = {
      jedi: true,
      age: 28
    };
    
    function getProp(prop) {
      return luke[prop];
    }
    
    var isJedi = getProp('jedi');
    

    [⬆]

Variables

  • Always use var to declare variables. Not doing so will result in global variables. We want to avoid polluting the global namespace. Captain Planet warned us of that.

    // bad
    superPower = new SuperPower();
    
    // good
    var superPower = new SuperPower();
    
  • Use one var declaration for multiple variables and declare each variable on a newline.

    // bad
    var items = getItems();
    var goSportsTeam = true;
    var dragonball = 'z';
    
    // good
    var items = getItems(),
        goSportsTeam = true,
        dragonball = 'z';
    
  • Declare unassigned variables last. This is helpful when later on you might need to assign a variable depending on one of the previous assigned variables.

    // bad
    var i, len, dragonball,
        items = getItems(),
        goSportsTeam = true;
    
    // bad
    var i, items = getItems(),
        dragonball,
        goSportsTeam = true,
        len;
    
    // good
    var items = getItems(),
        goSportsTeam = true,
        dragonball,
        length,
        i;
    
  • Assign variables at the top of their scope. This helps avoid issues with variable declaration and assignment hoisting related issues.

    // bad
    function() {
      test();
      console.log('doing stuff..');
    
      //..other stuff..
    
      var name = getName();
    
      if (name === 'test') {
        return false;
      }
    
      return name;
    }
    
    // good
    function() {
      var name = getName();
    
      test();
      console.log('doing stuff..');
    
      //..other stuff..
    
      if (name === 'test') {
        return false;
      }
    
      return name;
    }
    
    // bad
    function() {
      var name = getName();
    
      if (!arguments.length) {
        return false;
      }
    
      return true;
    }
    
    // good
    function() {
      if (!arguments.length) {
        return false;
      }
    
      var name = getName();
    
      return true;
    }
    

    [⬆]

Hoisting

  • Variable declarations get hoisted to the top of their scope, their assignment does not.

    // we know this wouldn't work (assuming there
    // is no notDefined global variable)
    function example() {
      console.log(notDefined); // => throws a ReferenceError
    }
    
    // creating a variable declaration after you
    // reference the variable will work due to
    // variable hoisting. Note: the assignment
    // value of `true` is not hoisted.
    function example() {
      console.log(declaredButNotAssigned); // => undefined
      var declaredButNotAssigned = true;
    }
    
    // The interpreter is hoisting the variable
    // declaration to the top of the scope.
    // Which means our example could be rewritten as:
    function example() {
      var declaredButNotAssigned;
      console.log(declaredButNotAssigned); // => undefined
      declaredButNotAssigned = true;
    }
    
  • Anonymous function expressions hoist their variable name, but not the function assignment.

    function example() {
      console.log(anonymous); // => undefined
    
      anonymous(); // => TypeError anonymous is not a function
    
      var anonymous = function() {
        console.log('anonymous function expression');
      };
    }
    
  • Named function expressions hoist the variable name, not the function name or the function body.

    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');
      }
    }
    
  • Function declarations hoist their name and the function body.

    function example() {
      superPower(); // => Flying
    
      function superPower() {
        console.log('Flying');
      }
    }
    
  • For more information refer to JavaScript Scoping & Hoisting by Ben Cherry

    [⬆]

Conditional Expressions & Equality

  • Use === and !== over == and !=.
  • Conditional expressions are evaluated using coercion with the ToBoolean method and always follow these simple rules:

    • 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
    if ([0]) {
      // true
      // An array is an object, objects evaluate to true
    }
    
  • Use shortcuts.

    // bad
    if (name !== '') {
      // ...stuff...
    }
    
    // good
    if (name) {
      // ...stuff...
    }
    
    // bad
    if (collection.length > 0) {
      // ...stuff...
    }
    
    // good
    if (collection.length) {
      // ...stuff...
    }
    
  • For more information see Truth Equality and JavaScript by Angus Croll

    [⬆]

Blocks

  • Use braces with all multi-line blocks.

    // bad
    if (test)
      return false;
    
    // good
    if (test) return false;
    
    // good
    if (test) {
      return false;
    }
    
    // bad
    function() { return false; }
    
    // good
    function() {
      return false;
    }
    

    [⬆]

Comments

  • Use /** ... */ for multiline comments. Include a description, specify types and values for all parameters and return values.

    // bad
    // make() returns a new element
    // based on the passed in tag name
    //
    // @param  tag
    // @return  element
    function make(tag) {
    
      // ...stuff...
    
      return element;
    }
    
    // good
    /**
     * make() returns a new element
     * based on the passed in tag name
     *
     * @param  tag
     * @return  element
     */
    function make(tag) {
    
      // ...stuff...
    
      return element;
    }
    
  • Use // for single line comments. Place single line comments on a newline above the subject of the comment. Put an empty line before the comment.

    // bad
    var active = true;  // is current tab
    
    // good
    // is current tab
    var active = true;
    
    // bad
    function getType() {
      console.log('fetching type...');
      // set the default type to 'no type'
      var type = this._type || 'no type';
    
      return type;
    }
    
    // good
    function getType() {
      console.log('fetching type...');
    
      // set the default type to 'no type'
      var type = this._type || 'no type';
    
      return type;
    }
    
  • Prefixing your comments with FIXME or TODO helps other developers quickly understand if you're pointing out a problem that needs to be revisited, or if you're suggesting a solution to the problem that needs to be implemented. These are different than regular comments because they are actionable. The actions are FIXME -- need to figure this out or TODO -- need to implement.

  • Use // FIXME: to annotate problems

    function Calculator() {
    
      // FIXME: shouldn't use a global here
      total = 0;
    
      return this;
    }
    
  • Use // TODO: to annotate solutions to problems

    function Calculator() {
    
      // TODO: total should be configurable by an options param
      this.total = 0;
    
      return this;
    }
    

    [⬆]

Whitespace

  • Use soft tabs set to 2 spaces

    // bad
    function() {
    ∙∙∙∙var name;
    }
    
    // bad
    function() {
    var name;
    }
    
    // good
    function() {
    ∙∙var name;
    }
    
  • Place 1 space before the leading brace.

    // bad
    function test(){
      console.log('test');
    }
    
    // good
    function test() {
      console.log('test');
    }
    
    // bad
    dog.set('attr',{
      age: '1 year',
      breed: 'Bernese Mountain Dog'
    });
    
    // good
    dog.set('attr', {
      age: '1 year',
      breed: 'Bernese Mountain Dog'
    });
    
  • Place an empty newline at the end of the file.

    // bad
    (function(global) {
      // ...stuff...
    })(this);
    
    // good
    (function(global) {
      // ...stuff...
    })(this);
    
    
  • Use indentation when making long method chains.

    // bad
    $('#items').find('.selected').highlight().end().find('.open').updateCount();
    
    // good
    $('#items')
      .find('.selected')
        .highlight()
        .end()
      .find('.open')
        .updateCount();
    
    // bad
    var leds = stage.selectAll('.led').data(data).enter().append('svg:svg').class('led', true)
        .attr('width',  (radius + margin) * 2).append('svg:g')
        .attr('transform', 'translate(' + (radius + margin) + ',' + (radius + margin) + ')')
        .call(tron.led);
    
    // good
    var leds = stage.selectAll('.led')
        .data(data)
      .enter().append('svg:svg')
        .class('led', true)
        .attr('width',  (radius + margin) * 2)
      .append('svg:g')
        .attr('transform', 'translate(' + (radius + margin) + ',' + (radius + margin) + ')')
        .call(tron.led);
    

    [⬆]

Commas

  • Leading commas: Nope.

    // bad
    var once
      , upon
      , aTime;
    
    // good
    var once,
        upon,
        aTime;
    
    // bad
    var hero = {
        firstName: 'Bob'
      , lastName: 'Parr'
      , heroName: 'Mr. Incredible'
      , superPower: 'strength'
    };
    
    // good
    var hero = {
      firstName: 'Bob',
      lastName: 'Parr',
      heroName: 'Mr. Incredible',
      superPower: 'strength'
    };
    
  • Additional trailing comma: Nope. This can cause problems with IE6/7 and IE9 if it's in quirksmode. Also, in some implementations of ES3 would add length to an array if it had an additional trailing comma. This was clarified in ES5 (source):

    Edition 5 clarifies the fact that a trailing comma at the end of an ArrayInitialiser does not add to the length of the array. This is not a semantic change from Edition 3 but some implementations may have previously misinterpreted this.

      // bad
      var hero = {
        firstName: 'Kevin',
        lastName: 'Flynn',
      };
    
      var heroes = [
        'Batman',
        'Superman',
      ];
    
      // good
      var hero = {
        firstName: 'Kevin',
        lastName: 'Flynn'
      };
    
      var heroes = [
        'Batman',
        'Superman'
      ];
    

    [⬆]

Semicolons

  • Yup.

    // bad
    (function() {
      var name = 'Skywalker'
      return name
    })()
    
    // good
    (function() {
      var name = 'Skywalker';
      return name;
    })();
    
    // good
    ;(function() {
      var name = 'Skywalker';
      return name;
    })();
    

    [⬆]

Type Casting & Coercion

  • Perform type coercion at the beginning of the statement.
  • Strings:

    //  => this.reviewScore = 9;
    
    // bad
    var totalScore = this.reviewScore + '';
    
    // good
    var totalScore = '' + this.reviewScore;
    
    // bad
    var totalScore = '' + this.reviewScore + ' total score';
    
    // good
    var totalScore = this.reviewScore + ' total score';
    
  • Use parseInt for Numbers and always with a radix for type casting.

    var inputValue = '4';
    
    // bad
    var val = new Number(inputValue);
    
    // bad
    var val = +inputValue;
    
    // bad
    var val = inputValue >> 0;
    
    // bad
    var val = parseInt(inputValue);
    
    // good
    var val = Number(inputValue);
    
    // good
    var val = parseInt(inputValue, 10);
    
  • If for whatever reason you are doing something wild and parseInt is your bottleneck and need to use Bitshift for performance reasons, leave a comment explaining why and what you're doing.

  • Note: Be careful when using bitshift operations. Numbers are represented as 64-bit values, but Bitshift operations always return a 32-bit integer (source). Bitshift can lead to unexpected behavior for integer values larger than 32 bits. Discussion

    // good
    /**
     * parseInt was the reason my code was slow.
     * Bitshifting the String to coerce it to a
     * Number made it a lot faster.
     */
    var val = inputValue >> 0;
    
  • Booleans:

    var age = 0;
    
    // bad
    var hasAge = new Boolean(age);
    
    // good
    var hasAge = Boolean(age);
    
    // good
    var hasAge = !!age;
    

    [⬆]

Naming Conventions

  • Avoid single letter names. Be descriptive with your naming.

    // bad
    function q() {
      // ...stuff...
    }
    
    // good
    function query() {
      // ..stuff..
    }
    
  • Use camelCase when naming objects, functions, and instances

    // bad
    var OBJEcttsssss = {};
    var this_is_my_object = {};
    function c() {};
    var u = new user({
      name: 'Bob Parr'
    });
    
    // good
    var thisIsMyObject = {};
    function thisIsMyFunction() {};
    var user = new User({
      name: 'Bob Parr'
    });
    
  • Use PascalCase when naming constructors or classes

    // bad
    function user(options) {
      this.name = options.name;
    }
    
    var bad = new user({
      name: 'nope'
    });
    
    // good
    function User(options) {
      this.name = options.name;
    }
    
    var good = new User({
      name: 'yup'
    });
    
  • Use a leading underscore _ when naming private properties

    // bad
    this.__firstName__ = 'Panda';
    this.firstName_ = 'Panda';
    
    // good
    this._firstName = 'Panda';
    
  • When saving a reference to this use _this.

    // bad
    function() {
      var self = this;
      return function() {
        console.log(self);
      };
    }
    
    // bad
    function() {
      var that = this;
      return function() {
        console.log(that);
      };
    }
    
    // good
    function() {
      var _this = this;
      return function() {
        console.log(_this);
      };
    }
    
  • Name your functions. This is helpful for stack traces.

    // bad
    var log = function(msg) {
      console.log(msg);
    };
    
    // good
    var log = function log(msg) {
      console.log(msg);
    };
    

    [⬆]

Accessors

  • Accessor functions for properties are not required
  • If you do make accessor functions use getVal() and setVal('hello')

    // bad
    dragon.age();
    
    // good
    dragon.getAge();
    
    // bad
    dragon.age(25);
    
    // good
    dragon.setAge(25);
    
  • If the property is a boolean, use isVal() or hasVal()

    // bad
    if (!dragon.age()) {
      return false;
    }
    
    // good
    if (!dragon.hasAge()) {
      return false;
    }
    
  • It's okay to create get() and set() functions, but be consistent.

    function Jedi(options) {
      options || (options = {});
      var lightsaber = options.lightsaber || 'blue';
      this.set('lightsaber', lightsaber);
    }
    
    Jedi.prototype.set = function(key, val) {
      this[key] = val;
    };
    
    Jedi.prototype.get = function(key) {
      return this[key];
    };
    

    [⬆]

Constructors

  • Assign methods to the prototype object, instead of overwriting the prototype with a new object. Overwriting the prototype makes inheritance impossible: by resetting the prototype you'll overwrite the base!

    function Jedi() {
      console.log('new jedi');
    }
    
    // bad
    Jedi.prototype = {
      fight: function fight() {
        console.log('fighting');
      },
    
      block: function block() {
        console.log('blocking');
      }
    };
    
    // good
    Jedi.prototype.fight = function fight() {
      console.log('fighting');
    };
    
    Jedi.prototype.block = function block() {
      console.log('blocking');
    };
    
  • Methods can return this to help with method chaining.

    // bad
    Jedi.prototype.jump = function() {
      this.jumping = true;
      return true;
    };
    
    Jedi.prototype.setHeight = function(height) {
      this.height = height;
    };
    
    var luke = new Jedi();
    luke.jump(); // => true
    luke.setHeight(20) // => undefined
    
    // good
    Jedi.prototype.jump = function() {
      this.jumping = true;
      return this;
    };
    
    Jedi.prototype.setHeight = function(height) {
      this.height = height;
      return this;
    };
    
    var luke = new Jedi();
    
    luke.jump()
      .setHeight(20);
    
  • It's okay to write a custom toString() method, just make sure it works successfully and causes no side effects.

    function Jedi(options) {
      options || (options = {});
      this.name = options.name || 'no name';
    }
    
    Jedi.prototype.getName = function getName() {
      return this.name;
    };
    
    Jedi.prototype.toString = function toString() {
      return 'Jedi - ' + this.getName();
    };
    

    [⬆]

Events

  • When attaching data payloads to events (whether DOM events or something more proprietary like Backbone events), pass a hash instead of a raw value. This allows a subsequent contributor to add more data to the event payload without finding and updating every handler for the event. For example, instead of:

    // bad
    $(this).trigger('listingUpdated', listing.id);
    
    ...
    
    $(this).on('listingUpdated', function(e, listingId) {
      // do something with listingId
    });
    

    prefer:

    // good
    $(this).trigger('listingUpdated', { listingId : listing.id });
    
    ...
    
    $(this).on('listingUpdated', function(e, data) {
      // do something with data.listingId
    });
    

    [⬆]

Modules

  • The module should start with a !. This ensures that if a malformed module forgets to include a final semicolon there aren't errors in production when the scripts get concatenated. Explanation
  • The file should be named with camelCase, live in a folder with the same name, and match the name of the single export.
  • Add a method called noConflict() that sets the exported module to the previous version and returns this one.
  • Always declare 'use strict'; at the top of the module.

    // fancyInput/fancyInput.js
    
    !function(global) {
      'use strict';
    
      var previousFancyInput = global.FancyInput;
    
      function FancyInput(options) {
        this.options = options || {};
      }
    
      FancyInput.noConflict = function noConflict() {
        global.FancyInput = previousFancyInput;
        return FancyInput;
      };
    
      global.FancyInput = FancyInput;
    }(this);
    

    [⬆]

jQuery

  • Prefix jQuery object variables with a $.

    // bad
    var sidebar = $('.sidebar');
    
    // good
    var $sidebar = $('.sidebar');
    
  • Cache jQuery lookups.

    // bad
    function setSidebar() {
      $('.sidebar').hide();
    
      // ...stuff...
    
      $('.sidebar').css({
        'background-color': 'pink'
      });
    }
    
    // good
    function setSidebar() {
      var $sidebar = $('.sidebar');
      $sidebar.hide();
    
      // ...stuff...
    
      $sidebar.css({
        'background-color': 'pink'
      });
    }
    
  • For DOM queries use Cascading $('.sidebar ul') or parent > child $('.sidebar > ul'). jsPerf

  • Use find with scoped jQuery object queries.

    // bad
    $('ul', '.sidebar').hide();
    
    // bad
    $('.sidebar').find('ul').hide();
    
    // good
    $('.sidebar ul').hide();
    
    // good
    $('.sidebar > ul').hide();
    
    // good
    $sidebar.find('ul');
    

    [⬆]

原文地址: 点此
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