【Apress】 JavaScript Recipes : A Problem-Solution Approach (2017)

是 否 +2 论坛币

k人 参与回答

经管之家送您一份

应届毕业生专属福利!

求职就业群

赵安豆老师微信：zhaoandou666

经管之家联合CDA

送您一个全额奖学金名额~ !

立即领取

感谢您参与论坛问题回答

经管之家送您两个论坛币！

+2 论坛币

JavaScript Recipes
A Problem-Solution Approach

Authors: Russ Ferguson, Keith Cirkel



Much more inclusive of varied JS problems than the direct O'Reilly competitor

Right up-to-date with the latest version of JavaScript

Includes recipes for using frameworks and Node.js as well as the main JS recipes

This comprehensive book is your go-to reference for tackling common and advanced JavaScript tasks. JavaScript is the world’s most popular client-side scripting language and is gaining popularity on the server. Using a problem-solution approach, this book takes you from language basics like built-in objects and flow control all the way to advanced optimization techniques, frameworks and Node.js. Quickly discover solutions to common problems, best practices you can follow, and everything JavaScript has to offer.

With JavaScript Recipes you will learn language fundamentals like types, conversions, execution contexts, expressions, operators, statements, and built-in objects. With this book you'll be able to explore and make the most of your script’s host environment and how to create your own JavaScript host using Google’s V8 engine. Employ advanced optimization techniques to create scripts that execute as fast, or faster, than native executables.

JavaScript Recipes shows you how to avoid wasting development time and concentrate on developing cutting-edge applications. You’ll see how much quicker and efficient it is to develop with JavaScript. Start becoming a JavaScript pro with JavaScript Recipes today.

目录截图：

本帖隐藏的内容

原版 PDF：
JavaScript Recipes_A Problem-Solution Approach.pdf (6.06 MB, 需要: 18 个论坛币)

2016-12-23 17:28:42 上传

需要: 18 个论坛币  [购买]

PDF 压缩包：
JavaScript Recipes_A Problem-Solution Approach.zip (4.71 MB, 需要: 18 个论坛币) 本附件包括：

• JavaScript Recipes_A Problem-Solution Approach.pdf

2016-12-23 17:28:56 上传

需要: 18 个论坛币  [购买]

扫码加我 拉你入群

请注明：姓名-公司-职位

以便审核进群资格，未注明则拒绝

分享0 收藏4 回帖

关键词：Javascript Solution Approach solutio problem popularity reference tackling problems version

看看    看看  

1. Listing 9-1. Objects Can Be Created Using Either the Object Constructor or by Creating an Object Literal
   
2. var R2D2 = new Object();
   
3. R2D2.class = 'Astromech Droid';
   
4. var R2D2 = {
   
5. class:'Astromech Droid';
   
6. manufacturer: 'Industrial Automaton';
   
7. };

复制代码

1. Listing 9-2. Accessing Properties of an Object Using Dot Notation and Bracket Syntax
   
2. var R2D2 = {
   
3. };
   
4. R2D2['class'] = 'Astromech Droid'
   
5. console.log(R2D2['class']); //returns Astromech Droid
   
6. R2D2.manufacturer = 'Industrial Automaton';
   
7. console.log(R2D2.manufacturer); //returns Industrial Automaton

复制代码

1. Listing 9-3. Some of the Differences Between Objects and Arrays
   
2. Object.prototype.good = "stuff";
   
3. var ship = {
   
4. type:40,
   
5. name:'tardis',
   
6. color:'blue'
   
7. };
   
8. for(var prop in ship){
   
9. console.log(prop + ': ' + ship[prop]);
   
10. }
    
11. var numArray = [1, 2, 3, 4, 5, 6, 7, 8, 9];
    
12. for(var prop in numArray){
    
13. console.log(prop + ': ' + numArray[prop]);
    
14. }
    
15. for(var i = 0; i <numArray.length; i++){
    
16. console.log(numArray[i]);
    
17. }
    
18. How It Works
    
19. Since almost everything you work with in JavaScript is an object, arrays also inherent properties of objects.
    
20. Depending on how you loop through the object or array, you access any enumerable property on the object
    
21. or its prototype. If you’re using a for…in loop, both the array and the object will access the “good” property.
    
22. When using a for loop on the array, only the indexed elements are accessed.

复制代码

1. Listing 9-4. Using Variables to Access Properties of an Object
   
2. var ship = {};
   
3. var type = 'spaceShip';
   
4. ship[type] = 'X-Wing';
   
5. console.log(ship[type]); //returns X-Wing
   
6. console.log(ship.spaceShip); //returns X-Wing
   
7. console.log(ship.type); //returns undefined

复制代码

1. Listing 9-5. Using the defineProperty Method Inside a Class
   
2. function SuperHeroTeam() {
   
3. this.name = 'The Avengers';
   
4. var _numberOfMembers; // private member
   
5. Object.defineProperty(this,"numberOfMemebers",{
   
6. get: function() { return _numberOfMembers; },
   
7. set: function(value) { _numberOfMembers = value; }
   
8. });
   
9. Object.defineProperty(this,"tagline",{
   
10. value: 'Earth\'s Mightiest Heroes',
    
11. configurable: false
    
12. });
    
13. }
    
14. var team = new SuperHeroTeam();
    
15. team.numberOfMembers = 8;
    
16. console.log(team.numberOfMembers);
    
17. team.tagline = 'The Amazing'; //not editable
    
18. console.log(team.tagline); // returns Earth's Mightiest Heroes

复制代码

1. Listing 9-6. getOwnPropertyNames Returns an Array of All Properties
   
2. function SuperHeroTeam() {
   
3. this.name = 'The Avengers';
   
4. var _numberOfMembers; // private member
   
5. Object.defineProperty(this,"numberOfMemebers",{
   
6. get: function() { return _numberOfMembers; },
   
7. set: function(value) { _numberOfMembers = value; }
   
8. });
   
9. 
   
10. Object.defineProperty(this,"tagline",{
    
11. value: 'Earth\'s Mightiest Heroes',
    
12. configurable: false
    
13. });
    
14. }
    
15. var team = new SuperHeroTeam();
    
16. Object.getOwnPropertyNames(team).forEach(function(val){
    
17. console.log(val); // returns name. numberOfNames, tagline
    
18. });

复制代码

1. Listing 9-7. Returning Only the Enumerable Properties of an Object
   
2. var myObj = {a:1, b:2, c:3};
   
3. console.log(Object.keys(myObj)); //returns ["a", "b", "c"]

复制代码

1. Listing 9-8. forEach Allows You to Perform a Function on Every Element of an Array, but Passes Undefined
   
2. If There Is No Value
   
3. var myObj = {a:1, b:2, c:3};
   
4. console.log(myObj.propertyIsEnumerable('a')); //returns true
   
5. console.log(myObj.propertyIsEnumerable('length')); //returns false

复制代码