javascript good parts pdf

prototype relationship is a dynamic relationship. If we add a new property to aPrototype, that property would immediately is visible in all of the objects that isBased on this prototype:Stooge.profession = ' actor ';Another_stooge.profession//' actor 'We'll see more about the prototype chain in Chapter 6.5Check the properties of the object (excluding functions and properties on the prototype chain)You can use the hasOwnProperty functionThe other approach are to use the hasOwnProperty method, wh

Combined use of JavaScript and select parts In the process of writing a program, I want to implement the option that is selected when the Select Object does not need to submit the button, but directly triggers the action, and after the action occurs To keep the selected option on the page. After being described, finally passed Using JavaScript and the onchange pr

determine whether an arrayvar Is_array = function (value) {return Object.prototype.toString.apply (value) = = = ' [Object Array] ';};6 Method (Methods)JavaScript provides a set of methods available for arrays, which are functions stored in Array.prototypeWe can augment him, for example, by adding an array to calculate the methodArray.prototype.reduce = function (f, value) {var i;for (i = 0; i Value = f (this[i], value);}return value;};Examples of usi

To learn a language, it is a shortcut to see a good book on the market. In the past few days, I have taken the time to read two books, JavaScript patterns and JavaScript good parts. # ASI (automatic semicolon insert) Javascript makes itself very good. If ";" is missing at the end of the code line, he will choose to ad

Combined use of JavaScript and select parts In the process of writing a program, I want to implement the option that is selected when the Select Object does not need to submit the button, but directly triggers the action, and after the action occurs To keep the selected option on the page. After being described, finally passed Using JavaScript and the onchange pr

Functions is values, and we can manipulate function values in interesting ways. Currying allows us to produce a new function by combining a function and an argument:var add1 = Add.curry (1);d Ocument.writeln (Add1 (6)); // 7Add1 is a function this was created by passing 1 to add ' s Curry method. The ADD1 function adds 1 to its argument. JavaScript does not has a curry method, but we can fix this by augmenting Function.prototype: function.method ('

Know how to create objects using object literals ; (attributes are separated by commas ) Data Properties and accessor properties There are four characteristics of data attributes: writable, Configurable, Enumerable, Value Accessor properties have four attributes: Configurable, Enumerable, Get, Set Method: How to define multiple properties Method: How to modify property default attributes JavaScript Advanced Programming: Chapter 6th Un

the language. To mitigate this problem, there was a convention that all constructor functions be named with an initial capital, and that Nothing else was spelled with a initial capital. This gives us a prayer that visual inspection can find a missing new. A Much better alternative is to the use of new at all.The pseudoclassical form can provide comfort to programmers who is unfamiliar with JavaScript, but it also hides the true Nature of the language

Extract A good parts of a language or technology and use this subset to construct robust and stable applications. We are always inclined to learn and use all the language features, as if all new and provided are necessary to use them. This book tells us that we should learn and use them selectively. Not all language features need to be learned and used. Learning and using poorly designed features not only consumes a lot of time and energy, but also d

A part of Natural Language processing (NLP) was processing text by "tokenizing" Language strings. This means we can break up a string of text to parts by word, sentence, etc. In this lesson, we'll use the natural library to tokenize a string. First, we'll break the string into words using WordTokenizer , WordPunctTokenizer and TreebankWordTokenizer . Then we'll break the string into sentences using RegexpTokenizer .var natural = require ('natural'),

,dialogwidth,center, etOpen the non-modal dialog: Window.showmodelessdialog ("url", "Value passed to target dialog box", "window feature parameter");var a = window.dialogargument; You can use a parameter to get the value passed by the modal or non-modal dialog box.3. Window.history ObjectWindow.history.back (); Page forward backward;Window.history.forward (); Page forward;Window.history.go (n); N If an integer represents the forward n page, n is a negative number that represents a backward n pag

When we were kids, we played jigsaw puzzles with our own hands. Today we're going to study the puzzle with JavaScript. The same puzzle, but with the JS puzzle than the hand puzzle more trouble, so later I want to optimize it into the engine. First, the preface The above is a section of lead, words do not pull far, to "kingdoms Cao Chuan" Familiar players know, "Kingdoms Cao Chuan" map is made of small map pieces, that to achieve it and the lead sai

entire project team can struggle for a while in the "script quagmire. Therefore, misuse of JavaScript will bring tears. However, in this case, JavaScript is still widely used in the Web application field. The page beautification capability of JavaScript is indeed incomparable. Its front-end simplification capability is also quite effective. @Xixi searched for